Examine source code of Raptor Background

{
  "theme": {
    "images": {
      "theme_frame": "RaptorPrintPersona1.jpg"
    },
    "colors": {
      "frame": "#595959",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Raptor Background",
  "manifest_version": 2,
  "description": "3D Raptor modeled by me, turned into a background"
}