Examine source code of ubuntu-Butterfly

{
  "theme": {
    "images": {
      "theme_frame": "butterfly-header.png"
    },
    "colors": {
      "frame": "#bfb4b4",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "ubuntu-Butterfly",
  "manifest_version": 2,
  "description": "Created from ubuntu 9.10 butterfly wallpaper."
}