Examine source code of Sundown 7

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#040404",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Sundown 7",
  "manifest_version": 2,
  "description": "A photo I took of a beautiful sunset on the lake that morphed into a painting.  For me, it's a lakescape with great memories, and one of my favorite (restful) themes. Created with GIMP."
}