Examine source code of Cherry Tree...

{
  "theme": {
    "images": {
      "theme_frame": "CherryTree_header_byLisa.jpg"
    },
    "colors": {
      "frame": "#333300",
      "tab_background_text": "#333300"
    }
  },
  "version": "2.0",
  "name": "Cherry Tree...",
  "manifest_version": 2,
  "description": "Cherry blossoms on a branch of a cherry tree, Springtime, Spring, fruit tree, flowers, scenery, Japan\n\nchild friendly persona\n\nPersonas by LisaAtTheBeach"
}