Free Design Wallpapers
Surfing the web I found these two awesome wallpapers free for personal use. They come in a variety of sizes (both for the desktop and the iPhone/iPad).
If you are searching for more ways to decorate your desktop, check out The Fox is Black website. Every Wednesday, they release a new desktop wallpaper as part of The Desktop Wallpaper Project, featuring the work of some of the best designers, photographers, and illustrators in the world.