Examine source code of Windows 7 - Nature 3

{
  "theme": {
    "images": {
      "theme_frame": "Windows7-Nature3header.jpg"
    },
    "colors": {
      "frame": "#c9c9c9",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Windows 7 - Nature 3",
  "manifest_version": 2,
  "description": "Made with one of the Windows 7 Nature wallpapers."
}