The wallpaper for December 2017 was taken by Thomas Obst of Kronberg im Taunus, Germany, taken in the Cuillin Hills, Isle of Skye. He's titled it "Rainbow over Coire na Banachdich"
To save the image, right-click (or alt-click) and select 'download as'. Check your device or system help for how to set the image as your wallpaper.
This is the first set of wallpaper from GetOutside - please let us know if there are any common screen sizes we are missing in the comments below. If you have your own images you would like to see featured, please send them to us - see our full submission guidelines here.