Examine source code of Green Aesthetic :D

{
  "name": "green",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "xbox.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 0)",
      "tab_background_text": "rgba(25, 59, 13, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(62, 89, 39, 1)",
      "toolbar_field": "rgba(29, 41, 5, 0.45)",
      "toolbar_field_text": "rgba(7, 31, 3, 1)"
    }
  }
}