Added: Dolphin

home/themes/dark/default.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+{
+
+    imports = [
+        ./qt.nix
+        ./gtk.nix
+    ];
+
+}

home/themes/dark/gtk.nix

@@ -0,0 +1,22 @@
+{ pkgs, ... }:
+{
+
+    gtk = {
+        enable = true;
+
+        theme = {
+            package = pkgs.flat-remix-gtk;
+            name = "Flat-Remix-GTK-Grey-Darkest";
+        };
+
+        iconTheme = {
+            package = pkgs.gnome.adwaita-icon-theme;
+            name = "Adwaita";
+        };
+
+        font = {
+            name = "Sans";
+            size = 12;
+        };
+    };
+}

home/themes/dark/qt.nix

@@ -0,0 +1,19 @@
+{ pkgs, ... }:
+{
+    
+    home.packages = with pkgs.libsForQt5; [
+        qt5ct
+        qtstyleplugin-kvantum
+    ];
+
+    qt = {
+        enable = true;
+        platformTheme = "qtct";
+        style.name = "kvantum";
+    };
+
+    xdg.configFile = {
+        "Kvantum/ArcDark".source = "${pkgs.arc-kde-theme}/share/Kvantum/ArcDark";
+        "Kvantum/kvantum.kvconfig".text = "[General]\ntheme=ArcDark";
+    };
+}