This should work for nature....hope so

{
  "walls": [
    {
   "author": "Reddit",
   "url": "https://i.imgur.com/fTAmur4.jpg",
   "thumb": "https://i.imgur.com/fTAmur4.jpg",
   "name": "GT-R"
    },
  ],
  "super": [
    {
      "author": "Unknown",
      "url": "https://images3.alphacoders.com/112/112487.jpg",
      "thumb": "https://images3.alphacoders.com/112/112487.jpg",
      "name": "green"
    },{
      "author": "Wallpaperscrave",
      "url": "http://wallpapercave.com/wp/vjaSDB8.jpg",
      "thumb": "http://wallpapercave.com/wp/vjaSDB8.jpg",
      "name": "Forest"
    },{
      "author": "fullhdpictures",
      "url": "http://fullhdpictures.com/wp-content/uploads/2016/02/Forest-HD-Wallpaper.jpg",
      "thumb": "http://fullhdpictures.com/wp-content/uploads/2016/02/Forest-HD-Wallpaper.jpg",
      "name": "Reflexion"
    },{
      "author": "wall.alphacoders",
      "url": "https://images2.alphacoders.com/846/84662.jpg",
      "thumb": "https://images2.alphacoders.com/846/84662.jpg",
      "name": "Bamboo"
    },{
      "author": "wallpapercrave",
      "url": "http://wallpapercave.com/wp/tQmwtaB.jpg",
      "thumb": "http://wallpapercave.com/wp/tQmwtaB.jpg",
      "name": "Wild Flowers"
    },{
      "author": "paper4pc",
      "url": "http://cdn.paper4pc.com/images/landscapes-snow-winter-sun-sunlight-beams-ray-wallpaper-1.jpg",
      "thumb": "http://cdn.paper4pc.com/images/landscapes-snow-winter-sun-sunlight-beams-ray-wallpaper-1.jpg",
      "name": "Autumn"
    },{
      "author": "superepus",
      "url": "http://static.hdw.eweb4.com/media/wallpapers_1920x1080/nature/1/1/sunlit-autumn-forest-nature-hd-wallpaper-1920x1080-3831.jpg",
      "thumb": "http://static.hdw.eweb4.com/media/wallpapers_1920x1080/nature/1/1/sunlit-autumn-forest-nature-hd-wallpaper-1920x1080-3831.jpg",
      "name": "Mother Nature"
    },

  ],
   "hyper": [
     {
      "author": "hdwallpapers",
      "url": "http://www.hdwallpapers.in/walls/ice_mountains-wide.jpg",
      "thumb": "http://www.hdwallpapers.in/walls/ice_mountains-wide.jpg",
      "name": "Frozen Mountains"
    },{
      "author": "hdwallpapers",
      "url": "http://www.hdwallpapers.in/walls/blue_mountains_dual_monitor-other.jpg",
      "thumb": ""http://www.hdwallpapers.in/walls/blue_mountains_dual_monitor-other.jpg,
      "name": "Panoramic"
    },{
      "author": "hdwallpapers",
      "url": "http://www.hdwallpapers.in/walls/mountain_valley-wide.jpg",
      "thumb": "http://www.hdwallpapers.in/walls/mountain_valley-wide.jpg",
      "name": "Mountain Valley"
    },{
      "author": "omgmix",
      "url": "http://1.bp.blogspot.com/-9VWTk3LsUrU/UAe8GnV6hWI/AAAAAAAAHCw/ATOzf-5b230/s1600/Hdhut.blogspot.com+(12).jpg",
      "thumb": "http://1.bp.blogspot.com/-9VWTk3LsUrU/UAe8GnV6hWI/AAAAAAAAHCw/ATOzf-5b230/s1600/Hdhut.blogspot.com+(12).jpg",
      "name": "Lake Reflection"
    },{
      "author": "7-themes",
      "url": "http://7-themes.com/data_images/collection/9/4507298-mountain-landscape-wallpapers.jpg",
      "thumb": "http://7-themes.com/data_images/collection/9/4507298-mountain-landscape-wallpapers.jpg",
      "name": "Snow"
    },{
      "author": "wallpapersawesome",
      "url": "http://www.wallpaperawesome.com/wallpapers-awesome/wallpapers-lg-g4-1440-2560-quad-hd-awesome/wallpaper-lg-g4-mountain-snow-1440-2560-qhd.jpg",
      "thumb": "http://www.wallpaperawesome.com/wallpapers-awesome/wallpapers-lg-g4-1440-2560-quad-hd-awesome/wallpaper-lg-g4-mountain-snow-1440-2560-qhd.jpg",
      "name": "Vulcano(Mobile)"
    },
  ],
   "sedan": [
     {
      "author": "wallpaperscraft",
      "url": "https://wallpaperscraft.com/image/hills_grass_sky_trees_105243_1440x2560.jpg",
      "thumb": "https://wallpaperscraft.com/image/hills_grass_sky_trees_105243_1440x2560.jpg",
      "name": "Hills and Forest"
    },{
      "author": "best-wallpapers",
      "url": "http://best-wallpaper.net/wallpaper/2560x1440/1302/Italy-sunset-fabulous-landscape-road-hills-nature_2560x1440.jpg",
      "thumb": "http://best-wallpaper.net/wallpaper/2560x1440/1302/Italy-sunset-fabulous-landscape-road-hills-nature_2560x1440.jpg",
      "name": "Sunset"
    },{
      "author": "best-wallpaper",
      "url": "http://best-wallpaper.net/wallpaper/2560x1440/1405/Nature-spring-hills-flowers-trees-sun_2560x1440.jpg",
      "thumb": "http://best-wallpaper.net/wallpaper/2560x1440/1405/Nature-spring-hills-flowers-trees-sun_2560x1440.jpg",
      "name": "Spring"
    },{
      "author": "best-wallpaper",
      "url": "http://best-wallpaper.net/wallpaper/2560x1440/1511/Morning-trees-sunlight-hills-grass_2560x1440.jpg",
      "thumb": "http://best-wallpaper.net/wallpaper/2560x1440/1511/Morning-trees-sunlight-hills-grass_2560x1440.jpg",
      "name": "Morning Sunlight"
    },{
      "author": "hdwallpapers",
      "url": "http://www.hdwallpapers.in/download/windows_xp_bliss-1920x1200.jpg",
      "thumb": "http://www.hdwallpapers.in/download/windows_xp_bliss-1920x1200.jpg",
      "name": "Classic XP"
    },
  ],
  "wagon": [

      "author": "yo mather",
      "url": "http://smsranjish.com/wp-content/uploads/2015/08/Sea-HD-Desktop-Wallpapers.jpg",
      "thumb": ""http://smsranjish.com/wp-content/uploads/2015/08/Sea-HD-Desktop-Wallpapers.jpg,
      "name": "Beach"
    },{
      "author": "yo mather",
      "url": "http://smsranjish.com/wp-content/uploads/2015/08/Sea-HD-Desktop-Wallpapers.jpg",
      "thumb": ""http://smsranjish.com/wp-content/uploads/2015/08/Sea-HD-Desktop-Wallpapers.jpg,
      "name": "Beach"
    },{
      "author": "yo mather",
      "url": "http://smsranjish.com/wp-content/uploads/2015/08/Sea-HD-Desktop-Wallpapers.jpg",
      "thumb": ""http://smsranjish.com/wp-content/uploads/2015/08/Sea-HD-Desktop-Wallpapers.jpg,
      "name": "Beach"
    },
  ],
  "jeep": [
  {
      "author": "wallpapersafari",
      "url": "http://cdn.wallpapersafari.com/20/76/LgGDa1.jpg",
      "thumb": "http://cdn.wallpapersafari.com/20/76/LgGDa1.jpg",
      "name": "Reflexion"
    },{
      "author": "wallpapersafari",
      "url": "http://cdn.wallpapersafari.com/20/76/LgGDa1.jpg",
      "thumb": "http://cdn.wallpapersafari.com/20/76/LgGDa1.jpg",
      "name": "Reflexion"
    },{
      "author": "wallpapersafari",
      "url": "http://cdn.wallpapersafari.com/20/76/LgGDa1.jpg",
      "thumb": "http://cdn.wallpapersafari.com/20/76/LgGDa1.jpg",
      "name": "Reflexion"
    },
  ],
   "jdm": [
     {
      "author": "fullhdpicture",
      "url": "http://fullhdpictures.com/wp-content/uploads/2015/12/Good-Ice-Wallpaper.jpg",
      "thumb": "http://fullhdpictures.com/wp-content/uploads/2015/12/Good-Ice-Wallpaper.jpg",
      "name": "Ice lake"
    },
  ],
   "hybrid": [
    {
      "author": "livehdwallpaper",
      "url": "http://livehdwallpaper.com/wp-content/uploads/2016/07/Jungle-Wallpapers-HD-Pictures.jpg",
      "thumb": "http://livehdwallpaper.com/wp-content/uploads/2016/07/Jungle-Wallpapers-HD-Pictures.jpg",
      "name": "Jungle"
    },
  ]
}