Reorganize themes to use "wallpaper.{ext}", rather than unique wallpaper names

nix/home-manager/themes/cooper/theme.nix

@@ -1,7 +1,7 @@
 { ... }:
 {
   stylix = {
-    image = ./cooper.png;
+    image = ./wallpaper.png;
     override = { base01 = "332330"; };
   };
 }

nix/home-manager/themes/material-blue/theme.nix

@@ -0,0 +1,6 @@
+{ pkgs, ... }:
+{
+  stylix = {
+    image = ./blue-material.jpg; 
+  };
+}

nix/home-manager/themes/material-red/theme.nix

@@ -0,0 +1,6 @@
+{ pkgs, ... }:
+{
+  stylix = {
+    image = ./red-black-material.jpg; 
+  };
+}

nix/home-manager/themes/nature-blue/theme.nix

@@ -0,0 +1,25 @@
+{ pkgs, ... }:
+{
+  stylix = {
+    image = ./wallpaper.jpg; 
+    override = { base01 = "332330"; };
+  };
+}
+
+# Generated Colors
+# base00: #111349; /* Black */
+# base01: #2c4482; /* Bright Black */
+# base02: #156eb2; /* Grey */
+# base03: #66a3da; /* Brighter Grey */
+# base04: #95bede; /* Bright Grey */
+# base05: #e2e1ef; /* White */
+# base06: #e0e3f4; /* Brighter White */
+# base07: #cce8f6; /* Bright White */
+# base08: #5196d1; /* Red */
+# base09: #5196cf; /* Orange */
+# base0A: #5796cc; /* Yellow */
+# base0B: #5595d3; /* Green */
+# base0C: #5896c9; /* Cyan */
+# base0D: #5795d0; /* Blue */
+# base0E: #4f96d8; /* Purple */
+# base0F: #5894d3; /* Magenta */

nix/home-manager/themes/nature-green/theme.nix

@@ -0,0 +1,6 @@
+{ pkgs, ... }:
+{
+  stylix = {
+    image = ./wallpaper.jpg; 
+  };
+}

nix/home-manager/themes/nature-red/theme.nix

@@ -0,0 +1,6 @@
+{ pkgs, ... }:
+{
+  stylix = {
+    image = ./wallpaper.jpg; 
+  };
+}