Examine source code of carnationsetc..

{
  "theme": {
    "images": {
      "theme_frame": "carnations.jpg"
    },
    "colors": {
      "frame": "#801839",
      "tab_background_text": "#45170a"
    }
  },
  "version": "2.0",
  "name": "carnationsetc..",
  "manifest_version": 2,
  "description": "red carnations"
}