That's not another list of lame landscape wallpapers but truly unique design pieces that you won't see elsewhere. I have listed my top 10 kick-ass wallpaper picks and also provided info on where you can get more of similar stuff.

Source 1: Wallpapr - wallpaper search engine (built on top of Flickr.)

possible search terms: graffiti, technology, abstract...

Source 2: ATI Radeon, NVidia wallpapers and nvidia gelato

Here you'll find around 50 high quality kick-ass wallpapers

Source 3: BestGameWallpapers - animated wallpapers from 100s of popular video games