Over at ConceptArt.org, one of their posters has published a huge amount of really amazing Guild Wars: Factions concept art. Some of it is really just Cthulhu cool. Of course, the actual game looks nothing like this, but there's scarce a picture in the bunch that wouldn't make a great wallpaper. Florian Eckhardt

Guild Wars Factions - Concept Art [Conceptart.org]