WLPPR - Beautiful mobile wallpapers made from satellite imagery
Wallhaven - Your source for the best high quality wallpapers on the Net!
Walllpaper - Turn Dribbble shots into backgrounds for every iOS device
Celwalls.com - Celwalls.
Psiu Puxa - Incredible wallpapers of space for desktop and mobile
Picky Wallpapers - Picky Wallpapers is a good website that has the selection of HD quality wallpapers only.