Examine source code of Twenty Fourteen

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#e8e3df",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Twenty  Fourteen",
  "manifest_version": 2,
  "description": "Designed by MaDonna\n\nMy wallpaper to match is at: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/82362a6777f38bac9374390e2830ae60ca28515d8414d1036190f7b6ff3a8451/http%3A//abstract.desktopnexus.com/wallpaper/1644549/\">http://abstract.desktopnexus.com/wallpaper/1644549/</a>"
}