Examine source code of sand metal

{
  "theme": {
    "images": {
      "theme_frame": "sand-metal_header.png"
    },
    "colors": {
      "frame": "#f7efef",
      "tab_background_text": "#f7efef"
    }
  },
  "version": "2.0",
  "name": "sand metal",
  "manifest_version": 2,
  "description": "simple design with metallic finish with sand paper pattern created in photoshop"
}