1. Veer
Collection of beautiful and unique wallpapers. A place which you can’t skip looking with google images as an excuse. No you can never find these through google image search.
Veer needs a free 2 minute registration process before you can download the full resolution wallpapers.
2. Vlad Studio
My personal favorite website to find great wallpapers. The drawing style wallpapers, you rarely find anywhere else. Vlad studio isn’t the place if you are searching for photo realistic wallpapers. The wallpapers they feature are more of a modern art type. It is a one man support website. All those come from the graphic skills of a single person.
3. Interfacelift
Then there is Interfacelift selected as the best by people. In a recent poll by lifehacker, interfacelift won. Interfacelift was voted the best by 36% of the lifehacker readers. Presently 2041 wallpapers, each handpicked.
4. Deviantart
Deviantart is a online art community. People share their piece of art or photography on the website. Search for wallpapers in the search box of Deviantart. The pictures that get a tag “wallpaper” among number of other tags, land on your search page. Deviantart scored 2nd highest number of votes on the Lifehacker poll.
5. PixelGirl
Not mentioned at many places, Pixelgirl hosts beautiful wallpapers. coolest Mac OS X Windows icons and desktop images for your computer and mobile gear as well as offering tutorials, articles and links.
Gaming geeky wallpapers: Desktopgaming
Windows 7 theme wallpapers: Howtogeek
Guitar wallpers: Howtogeek
Other great websites via Lifehacker I haven’t used till date: 4Chanwallpapers
SocialWallpapering
DigitalBlasphemy
and Mandolux