1920 x 1080 wallpaper. Illustrations by Nazir Agah

For Mac:

1. Download the swanky wallpaper.
2. Go to Apple menu > System Preferences, select Desktop & Screensaver (in Personal section)
3. Select the wallpaper file.
4. Revel in the awesomeness of your new desktop image.

Other sizes:
2560 x 1440
1440 x 900
1680 x 1050