Examine source code of Simply Blur.

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Simply Brown.",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(196, 190, 187)",
      "toolbar_text": "rgb(39, 41, 41)",
      "frame": "rgb(38, 45, 45)",
      "tab_background_text": "rgb(39, 41, 41)",
      "toolbar_field": "rgb(196, 190, 187)",
      "toolbar_field_text": "rgb(78, 45, 45)",
      "tab_line": "rgb(196, 190, 187)",
      "popup": "rgb(39, 41, 41)",
      "popup_text": "rgb(196, 190, 187)",
      "button_background_hover": "rgb(196, 190, 187)",
      "icons": "rgb(39, 41, 41)",
      "ntp_background": "rgb(28, 25, 25)",
      "sidebar_border": "rgb(78, 45, 45)",
      "sidebar_text": "rgb(39, 41, 41)",
      "sidebar": "rgb(196, 190, 187)",
      "tab_background_separator": "rgb(78, 45, 45)",
      "tab_loading": "rgb(78, 45, 45)",
      "tab_text": "rgb(64, 56, 56)"
    }
  }
}