Examine source code of Unreal Development Kit

{
  "theme": {
    "images": {
      "theme_frame": "Header_UnrealTheme.jpg"
    },
    "colors": {
      "frame": "#ff7e4f",
      "tab_background_text": "#450404"
    }
  },
  "version": "2.0",
  "name": "Unreal Development Kit",
  "manifest_version": 2,
  "description": "Everything by 1337 Themes except for the UDK Symbol. amazing, isn't it? Header image was so detailed I had to switch its file type to JPEG."
}