Examine source code of NatureTheme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "NatureTheme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(240, 249, 240)",
      "toolbar_text": "rgb(53, 116, 44)",
      "frame": "rgb(93, 234, 165)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(40, 72, 46)",
      "tab_line": "rgb(239, 241, 245)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(3, 5, 62)",
      "tab_loading": "rgb(239, 241, 245)"
    }
  }
}