I like Wariopunk's the best, the horse head nebula pictures are so amazing!
For some reason I always loved pylons, their juxtaposition against natures seems oddly soothing and almost post apocalyptic, like if the world reverted to how it was before man, these iron constructs would always be there to show we existed. But I digress. Pylons - my desktop.
Had to make it shitty quality because it was 400kb over the limit and image resizers kept backfiring. Nvm.