I have stumbled on the most amazing source for wallpaper... Graham & Brown!
They have the funkiest paper I have ever seen. Black and white frames that you or your kids can color any way you want... super cute in a kids bathroom! A textured paper that you can paint over to match your decor. Not to mention bright colors and funky patterns.
I'm obsessing over all of these..... http://www.grahambrown.com/
Frames: Black & White
Darcy: White & Silver
Mystique: Green Wallpaper
Vivid: Black & White
Symmetry: Green & Beige
all images are from http://www.grahamandbrown.com/