Examine source code of Summer Stripes...

{
  "theme": {
    "images": {
      "theme_frame": "SummerStripes_header_byLisa.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#993300"
    }
  },
  "version": "2.0",
  "name": "Summer Stripes...",
  "manifest_version": 2,
  "description": "background design, coral, peach, lemon yellow and white vertical stripes, bright warm colors\n\nchild friendly persona\n\nPersonas by LisaAtTheBeach"
}