Examine source code of Spring Rain ...

{
  "theme": {
    "images": {
      "theme_frame": "green.jpg"
    },
    "colors": {
      "frame": "#faf191",
      "tab_background_text": "#cffbfc"
    }
  },
  "version": "2.0",
  "name": "Spring Rain ...",
  "manifest_version": 2,
  "description": "Green Grass,Summer ,Blue Sky,\nHolidays,Easter..."
}