I wanted a black and white room for both my kids. With hints of dark blue and army green for him and mint and pink for her, but they both argued with me when I suggested it, so I didn't.
They apparently dont understand black and white doesn't have to be boring and want rooms with a) all Ninjago / Skylander posters (over my dead body!) or b) all colors of the rainbow, with highlights in gold and fuschia pink (which is a color I really dislike). I will just have to wait until I can make another little kid happy with a black & white themed room ;).
Black and white can be a very versatile and subtle way to style a kids room. You can add a little pastel color to soften it up a bit or a dash a bright color like yellow or red to give a cool and playfull vibe.
Ferm Living also has some cool black&white stuff like wallpaper and cushions.
pic credits for liveloudgirl, eeflillemor, smallable and uberkid
Some really great and inspiring blogs and websites with lots and lots of kids inspiration.