I made these from a false color infrared + red + blue-green (IRB) image (PSP0068061365) taken by the HiRISE (High Resolution Imaging Science Experiment) instrument on the Mars Reconnaissance Orbiter.
Each wallpaper is in 16:9 and the weird-ass aspect ratio used by Apple's Retina laptop displays
Click the pictures to download full resolution versions.
Wallpaper 1
16:9
Retina
Wallpaper 2
16:9
Retina
Wallpaper 3
16:9
Retina
Wallpaper 4
16:9
Retina