Here you can download Discover the REAL world wallpapers if you ever so desire. To get them as your desktop wallpaper, choose a size, 1280x1024 or 1024x768. This size is the number of pixels your screen is displaying. If you're not sure on which number to choose just go for the biggest 1280x1024, it should automatically resize.

PC users, FireFox:
Once the wallpaper has loaded, right click and choose "Set as Desktop Background", make sure the position is 'Center', then click "Set Desktop Background".

PC users, Internet Explorer:
Once the wallpaper has loaded, right click and choose "Set as Background"

Mac Users:
Once the wallpaper has loaded, Control Click on the image and select "Save Image To Desktop". Then open "Desktop & Screen Saver" in System Prefences, click on the "Desktop" tab. Find the wallpaper on your desktop, then select the wallpaper to set as your desktop wallpaper.