Examine source code of Pretty Butterfly...

{
  "theme": {
    "images": {
      "theme_frame": "PrettyButterfly_header_byLisa.png"
    },
    "colors": {
      "frame": "#5d8fd4",
      "tab_background_text": "#ccffff"
    }
  },
  "version": "2.0",
  "name": "Pretty Butterfly...",
  "manifest_version": 2,
  "description": "A vibrant blue butterfly hovers over a flower blossom. [Abstract, blue skies, white and blue chrysanthemum, floral, simple, serene] \n\nchild friendly persona\n\nPersonas by LisaAtTheBeach"
}