Examine source code of Blue Willow

{
  "theme": {
    "images": {
      "theme_frame": "bluewillowlow.png"
    },
    "colors": {
      "frame": "#0c0f45",
      "tab_background_text": "#1c4485"
    }
  },
  "version": "2.0",
  "name": "Blue Willow",
  "manifest_version": 2,
  "description": "Design from various 'Blue Willow' plates. I love this style."
}