Examine source code of Blue Day

{
  "theme": {
    "images": {
      "theme_frame": "Sky-Swirls-Header.jpg"
    },
    "colors": {
      "frame": "#9bc0f5",
      "tab_background_text": "#f7f7f7"
    }
  },
  "version": "2.0",
  "name": "Blue Day",
  "manifest_version": 2,
  "description": "Pretty abstract sky blue swirls.  (Search Tags: blue turquoise sky white light dark circles swirls retro modern contemporary vines vine leaf swirl flourish pale bright clouds cloud design illustration vector pretty girly cute soft relaxing happy cheerful art graphic drawing circles dots curves deep beautiful )"
}