Examine source code of Vista.Style.Simple.10

{
  "theme": {
    "images": {
      "theme_frame": "persona-10.jpg"
    },
    "colors": {
      "frame": "#fcec9c",
      "tab_background_text": "#4a3400"
    }
  },
  "version": "2.0",
  "name": "Vista.Style.Simple.10",
  "manifest_version": 2,
  "description": "vista, simple, brushed, metal, bronze, gold, golden"
}