diff --git a/configs/default.nix b/configs/default.nix
index a88c162..d72328e 100644
--- a/configs/default.nix
+++ b/configs/default.nix
@@ -1,13 +1,10 @@
-{ pkgs, lib, config, ... }:
+{ pkgs, lib, config, options, ... }:
 let
   inherit (lib.strings) makeBinPath;
 in
 {
   imports = [
     <niveum/modules/constants.nix>
-    {
-      services.dbus.packages = [ pkgs.gnome3.dconf ];
-    }
     <home-manager/nixos>
     # ./mopidy.nix
     ./alacritty.nix
@@ -75,67 +72,78 @@ in
       };
     }
     {
-      nix.nixPath = [ "/var/src" ];
+      nix.nixPath = options.nix.nixPath.default ++ [
+        "/var/src"
+        "nixpkgs-overlays=${toString ../overlays}"
+      ];
     }
     {
-      nixpkgs.config = {
-        allowUnfree = true;
-        packageOverrides = pkgs: {
-          python3Packages = pkgs.python3Packages.override {
-            overrides = new: old: {
-              spotify-cli-linux = new.callPackage <niveum/packages/spotify-cli-linux.nix> {};
-              instaloader = new.callPackage <niveum/packages/instaloader.nix> {};
-              sncli = new.callPackage <niveum/packages/sncli.nix> {};
-            };
-          };
-          haskellPackages = pkgs.haskellPackages.override {
-            overrides = new: old: {
-              blessings = new.callPackage <niveum/packages/blessings.nix> {};
-              scanner = new.callPackage <stockholm/krebs/5pkgs/haskell/scanner.nix> {};
-            };
-          };
-
-          git-quick-stats = pkgs.callPackage <niveum/packages/git-quick-stats.nix> {};
-          writeDash = pkgs.writers.writeDash;
-          writeDashBin = pkgs.writers.writeDashBin;
-          iolanguage = pkgs.callPackage <niveum/packages/iolanguage.nix> {};
-          nix-git = pkgs.callPackage <niveum/packages/nix-git.nix> {};
-          gfs-fonts = pkgs.callPackage <niveum/packages/gfs-fonts.nix> {};
-
-          kmein = {
-            autorenkalender = pkgs.callPackage <niveum/packages/autorenkalender.nix> {};
-            bvg = pkgs.callPackage <niveum/packages/bvg.nix> {};
-            daybook = pkgs.callPackage <niveum/packages/daybook.nix> {};
-            genius = pkgs.callPackage <niveum/packages/genius.nix> {};
-            instaget = pkgs.callPackage <niveum/packages/instaget.nix> {};
-            literature-quote = pkgs.callPackage <niveum/packages/literature-quote.nix> {};
-            n = pkgs.callPackage <niveum/packages/n.nix> {};
-            depp = pkgs.callPackage <niveum/packages/depp.nix> {};
-            odyssey = pkgs.callPackage <niveum/packages/odyssey.nix> {};
-            wttr = pkgs.callPackage <niveum/packages/wttr.nix> {};
-            nav = pkgs.callPackage <niveum/packages/nav.nix> {};
-            dirmir = pkgs.callPackage <niveum/packages/dirmir.nix> {};
-            favicon = pkgs.callPackage <niveum/packages/favicon.nix> {};
-            tolino-screensaver = pkgs.callPackage <niveum/packages/tolino-screensaver.nix> {};
-            # fzf-wrappers = pkgs.callPackage <niveum/packages/fzf-wrappers.nix> {}; (broken)
-            slide =
-              let slide-package = pkgs.fetchFromGitHub {
-                owner = "kmein";
-                repo = "slide";
-                rev = "0470583d22212745eab4f46076267addf4d2346c";
-                sha256 = "0skcp3va9v4hmxy5ramghpz53gnyxv10wsacgmc2jr0v1wrqlzbh";
+      services.dbus.packages = [ pkgs.gnome3.dconf ];
+    }
+    {
+      nixpkgs = {
+        config.allowUnfree = true;
+        overlays = [
+          # (import <stockholm/submodules/nix-writers>)
+          (import <niveum/overlays/toml.nix>)
+          (self: super: {
+            python3Packages = super.python3Packages.override {
+              overrides = new: old: {
+                spotify-cli-linux = new.callPackage <niveum/packages/spotify-cli-linux.nix> {};
+                instaloader = new.callPackage <niveum/packages/instaloader.nix> {};
+                sncli = new.callPackage <niveum/packages/sncli.nix> {};
               };
-              in pkgs.callPackage slide-package {};
-            haskellPackages.mnemosyne =
-              let mnemosyne-package = pkgs.fetchFromGitHub {
-                repo = "mnemosyne";
-                owner = "kmein";
-                rev = "6bfa13c88db176af80be90840ff03573d67d679f";
-                sha256 = "1rimv5c5q9602y501hbkgkfbimqnmdkcr5hp1434q06gcazhjhca";
+            };
+            haskellPackages = super.haskellPackages.override {
+              overrides = new: old: {
+                blessings = new.callPackage <niveum/packages/blessings.nix> {};
+                scanner = new.callPackage <stockholm/krebs/5pkgs/haskell/scanner.nix> {};
               };
-              in pkgs.haskellPackages.callPackage mnemosyne-package {};
-          };
-        };
+            };
+
+            writeDashBin = super.writers.writeDashBin;
+            writeDash = super.writers.writeDash;
+
+            git-quick-stats = super.callPackage <niveum/packages/git-quick-stats.nix> {};
+            iolanguage = super.callPackage <niveum/packages/iolanguage.nix> {};
+            nix-git = super.callPackage <niveum/packages/nix-git.nix> {};
+            gfs-fonts = super.callPackage <niveum/packages/gfs-fonts.nix> {};
+
+            kmein = {
+              autorenkalender = super.callPackage <niveum/packages/autorenkalender.nix> {};
+              bvg = super.callPackage <niveum/packages/bvg.nix> {};
+              daybook = super.callPackage <niveum/packages/daybook.nix> {};
+              genius = super.callPackage <niveum/packages/genius.nix> {};
+              instaget = super.callPackage <niveum/packages/instaget.nix> {};
+              literature-quote = super.callPackage <niveum/packages/literature-quote.nix> {};
+              n = super.callPackage <niveum/packages/n.nix> {};
+              depp = super.callPackage <niveum/packages/depp.nix> {};
+              odyssey = super.callPackage <niveum/packages/odyssey.nix> {};
+              wttr = super.callPackage <niveum/packages/wttr.nix> {};
+              nav = super.callPackage <niveum/packages/nav.nix> {};
+              dirmir = super.callPackage <niveum/packages/dirmir.nix> {};
+              favicon = super.callPackage <niveum/packages/favicon.nix> {};
+              tolino-screensaver = super.callPackage <niveum/packages/tolino-screensaver.nix> {};
+              # fzf-wrappers = pkgs.callPackage <niveum/packages/fzf-wrappers.nix> {}; (broken)
+              slide =
+                let slide-package = super.fetchFromGitHub {
+                  owner = "kmein";
+                  repo = "slide";
+                  rev = "0470583d22212745eab4f46076267addf4d2346c";
+                  sha256 = "0skcp3va9v4hmxy5ramghpz53gnyxv10wsacgmc2jr0v1wrqlzbh";
+                };
+                in super.callPackage slide-package {};
+              haskellPackages.mnemosyne =
+                let mnemosyne-package = super.fetchFromGitHub {
+                  repo = "mnemosyne";
+                  owner = "kmein";
+                  rev = "6bfa13c88db176af80be90840ff03573d67d679f";
+                  sha256 = "1rimv5c5q9602y501hbkgkfbimqnmdkcr5hp1434q06gcazhjhca";
+                };
+                in super.haskellPackages.callPackage mnemosyne-package {};
+            };
+          })
+        ];
       };
     }
     {
@@ -226,7 +234,7 @@ in
         ll = "${pkgs.exa}/bin/exa -s type -l";
         ls = "${pkgs.exa}/bin/exa -s type";
         mv = "mv -i";
-        nixi = "nix repl '<nixos/nixpkgs>'";
+        nixi = "nix repl '<nixpkgs>'";
         ns = "nix-shell --run zsh";
         o = "${pkgs.xdg_utils}/bin/xdg-open";
         rm = "rm -i";
@@ -313,12 +321,6 @@ in
     {
       programs.command-not-found.enable = true;
     }
-    {
-      programs.java = {
-        enable = true;
-        package = pkgs.openjdk;
-      };
-    }
     {
       systemd.services.restart-vpn = {
         description = "Restart VPNs after suspend";
diff --git a/configs/i3.nix b/configs/i3.nix
index b981c5d..024c27c 100644
--- a/configs/i3.nix
+++ b/configs/i3.nix
@@ -61,13 +61,13 @@ in with config.niveum; {
             text = colours.foreground;
           };
         };
-        statusCommand = "${pkgs.unstable.i3status-rust}/bin/i3status-rs ${pkgs.writeText "i3status-rust.toml" (
-          import <niveum/dot/i3status-rust.nix> {
+        statusCommand = "${pkgs.unstable.i3status-rust}/bin/i3status-rs ${
+          pkgs.writeTOML (import <niveum/dot/i3status-rust.nix> {
             wifi-interface = networkInterfaces.wireless;
             batteryBlock = batteryBlocks.default;
             inherit (config.niveum) colours;
-          }
-        )}";
+          })
+        }";
       }];
       keybindings = {
         "${modifier}+Down" = "focus down";
diff --git a/dot/i3status-rust.nix b/dot/i3status-rust.nix
index 0dcec74..1841731 100644
--- a/dot/i3status-rust.nix
+++ b/dot/i3status-rust.nix
@@ -1,81 +1,85 @@
-{ wifi-interface, colours, batteryBlock }: ''
-  [theme]
-  name = "plain"
-  [theme.overrides]
-  separator = " "
-  critical_fg = "${colours.red.bright}"
-  good_fg = "${colours.green.bright}"
-  idle_fg = "${colours.foreground}"
-  info_fg = "${colours.foreground}"
-  separator_fg = "auto"
-  warning_fg = "${colours.yellow.bright}"
-  alternating_tint_bg = "${colours.background}"
-  alternating_tint_fg = "${colours.background}"
-  critical_bg = "${colours.background}"
-  good_bg = "${colours.background}"
-  idle_bg = "${colours.background}"
-  info_bg = "${colours.background}"
-  separator_bg = "auto"
-  warning_bg = "${colours.background}"
-
-  [icons]
-  name = "none"
-  [icons.overrides]
-  music = "♫ "
-  music_play = "►"
-  music_next = "→"
-  music_prev = "←"
-  volume_full = "♪ "
-  volume_half = "♪ "
-  volume_empty = "♪ "
-  bat =  "⚡ "
-  bat_full = "⚡ "
-  bat_charging = "↑ "
-  bat_discharging = "↓ "
-  memory_mem = ""
-  separator = ""
-  net_wireless = ""
-  cogs = ""
-  time = ""
-
-  [[block]]
-  block = "music"
-  player = "spotify"
-  buttons = ["prev", "play", "next"]
-  marquee = false
-  max_width = 35
-  # on_collapsed_click = "spotify"
-
-  [[block]]
-  block = "net"
-  device = "${wifi-interface}"
-  ssid = true
-  interval = 1
-  speed_up = false
-  speed_down = false
-
-  [[block]]
-  block = "battery"
-  device = "${batteryBlock}"
-  show = "both"
-
-  [[block]]
-  block = "sound"
-  # show_volume_when_muted = true
-
-  [[block]]
-  block = "memory"
-  display_type = "memory"
-  format_mem = "{MUg}G"
-  clickable = false
-
-  [[block]]
-  block = "load"
-  interval = 1
-  format = "{1m}"
-
-  [[block]]
-  block = "time"
-  interval = 5
-  format = "%Y-%m-%d %H:%M"
-''
+{ wifi-interface, colours, batteryBlock }:
+{
+  theme = {
+    name = "plain";
+    overrides = {
+      separator = " ";
+      critical_fg = colours.red.bright;
+      good_fg = colours.green.bright;
+      idle_fg = colours.foreground;
+      info_fg = colours.foreground;
+      separator_fg = "auto";
+      warning_fg = colours.yellow.bright;
+      alternating_tint_bg = colours.background;
+      alternating_tint_fg = colours.background;
+      critical_bg = colours.background;
+      good_bg = colours.background;
+      idle_bg = colours.background;
+      info_bg = colours.background;
+      separator_bg = "auto";
+      warning_bg = colours.background;
+    };
+  };
+  icons = {
+    name = "none";
+    overrides = {
+      music = "♫ ";
+      music_play = "►";
+      music_next = "→";
+      music_prev = "←";
+      volume_full = "♪ ";
+      volume_half = "♪ ";
+      volume_empty = "♪ ";
+      bat =  "⚡ ";
+      bat_full = "⚡ ";
+      bat_charging = "↑ ";
+      bat_discharging = "↓ ";
+      memory_mem = "";
+      separator = "";
+      net_wireless = "";
+      cogs = "";
+      time = "";
+    };
+  };
+  block = [
+    {
+      block = "music";
+      player = "spotify";
+      buttons = ["prev" "play" "next"];
+      marquee = false;
+      max_width = 35;
+    }
+    {
+      block = "net";
+      device = wifi-interface;
+      ssid = true;
+      interval = 1;
+      speed_up = false;
+      speed_down = false;
+    }
+    {
+      block = "battery";
+      device = batteryBlock;
+      show = "both";
+    }
+    {
+      block = "sound";
+    }
+    {
+      block = "memory";
+      display_type = "memory";
+      format_mem = "{MUg}G";
+      clickable = false;
+    }
+    {
+      block = "load";
+      interval = 1;
+      format = "{1m}";
+    }
+    {
+      block = "time";
+      interval = 5;
+      format = "%Y-%m-%d %H:%M";
+    }
+  ];
+}
diff --git a/overlays/overlays.nix b/overlays/overlays.nix
new file mode 100644
index 0000000..ac6acf2
--- /dev/null
+++ b/overlays/overlays.nix
@@ -0,0 +1,6 @@
+self: super:
+with super.lib;
+let
+  eval = import <nixpkgs/nixos/lib/eval-config.nix>;
+  paths = (eval {modules = [(import <nixos-config>)];}).config.nixpkgs.overlays;
+in foldl' (flip extends) (_: super) paths self
diff --git a/overlays/toml.nix b/overlays/toml.nix
new file mode 100644
index 0000000..75f20f6
--- /dev/null
+++ b/overlays/toml.nix
@@ -0,0 +1,6 @@
+(self: super: {
+  writeTOML = object: super.runCommand "writeTOML" {} ''
+    echo '${builtins.toJSON object}' | ${super.remarshal}/bin/json2toml > $out
+  '';
+  toTOML = object: builtins.readFile (self.writeTOML object);
+})