Examine source code of Icicles..

{
  "theme": {
    "images": {
      "theme_frame": "icyclesH.jpg"
    },
    "colors": {
      "frame": "#d9caca",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Icicles..",
  "manifest_version": 2,
  "description": "winter, sparkle, cold, ice, icicles, freeze frozen, water, Christmas, season, frost, stars, snow, sparkle, eves\n\nDesigned by MaDonna"
}