diff --git a/configurations/nixos/example/default.nix b/configurations/nixos/example/default.nix
index 6c91571..127f292 100644
--- a/configurations/nixos/example/default.nix
+++ b/configurations/nixos/example/default.nix
@@ -9,6 +9,7 @@ in
 {
   imports = [
     self.nixosModules.default
+    self.nixosModules.gui
     ./configuration.nix
   ];
 
diff --git a/modules/nixos/default.nix b/modules/nixos/default.nix
index f07c590..05e3da2 100644
--- a/modules/nixos/default.nix
+++ b/modules/nixos/default.nix
@@ -7,5 +7,8 @@ let
   inherit (inputs) self;
 in
 {
+  # These users can add Nix caches.
+  nix.settings.trusted-users = [ "root" "runner" ];
+
   services.openssh.enable = true;
 }
diff --git a/modules/nixos/gui/default.nix b/modules/nixos/gui/default.nix
new file mode 100644
index 0000000..7d6a4ac
--- /dev/null
+++ b/modules/nixos/gui/default.nix
@@ -0,0 +1,6 @@
+{
+  imports = [
+    ./gnome.nix
+  ];
+  services.xserver.enable = true;
+}
diff --git a/modules/nixos/gui/gnome.nix b/modules/nixos/gui/gnome.nix
new file mode 100644
index 0000000..c481db8
--- /dev/null
+++ b/modules/nixos/gui/gnome.nix
@@ -0,0 +1,11 @@
+{ pkgs, ... }:
+{
+  services.xserver = {
+    displayManager.gdm.enable = true;
+    desktopManager.gnome.enable = true;
+  };
+
+  environment.systemPackages = with pkgs; [
+    gnome.gnome-tweaks
+  ];
+}