This wallpaper by Graham & Brown with its interlocking O pattern recently caught my eye. It's simple but makes an impact, and although it's available in more colors, I prefer the neutral, white and silver combination (surprise!):
I like to use big, cheery pops of color throughout the rest of a room with a white wall, but I can easily imagine this paper used in a very serene neutral setting, too. And by the way, it's called Darcy. So they're clearly targeting this Austen fan.