Hey, if they keep putting out wallpaper like this, I'm gonna say you can never have too many Bradbury's. Atomic, Post-War, Mod Generation, Art Deco - they're all collections of amazingly awesome wallpaper from Bradbury & Bradbury, an artistic wallpaper supplier based out of Benicia, California. If there's a specific style you're looking for, chances are they have it. Plus, in a world of $200+/roll designer wallpapers, their prices really can't be beat!
Check out all their offerings here (they even have Victorian, Arts & Crafts, and Damask collections).