Flickr has an amazing collection of wallpapers if you are looking for a perfect wallpaper to pimp your desktop. Although Flickr has a great collection it is not convenient to screen large number of wallpapers at any time.
Wallpapr is new search engine designed for Flickr photos. Type to search for wallpapers using keywords of [...]

I stumbled over these great wallpaper collection of tuxbrothers.net. They have a great collection of wallpapers for the linux freaks. Full wallpaper collection is here, below my 10 favourite wallpapers from the list.
Download the wallpapers from here