Work PC - a beatiful shot of the starship Normandy SR-1 from the Bioware game Mass Effect
Netbook - NSFW fanart of two characters from the Square Enix video game Final Fantasy XIII
Home PC - X-Files Christmas wallpaper. Ive had an X-files wallpaper on one of my computers for as long as I've had my own computer.
Partner's PC - She has the most gorgeous of the lot, so I'll post it below:
... yes, I really am that much of a geek.