Examine source code of OnDeck

{
  "theme": {
    "images": {
      "theme_frame": "Wood_head"
    },
    "colors": {
      "frame": "#e66c6c",
      "tab_background_text": "#f5eded"
    }
  },
  "version": "2.0",
  "name": "OnDeck",
  "manifest_version": 2,
  "description": "Very simple wood-look using free textures available on web."
}