I like this room because the blue and red go together well and the colors aren't really bright. The room gives a laid-back environment.
http://room-galleries.myhomeideas.com/pictures/bedrooms/kids-bedrooms/reds/index.html?N=765+961+804&view=gallery&ad=1&No=5&dir=back&sp=topRated
http://www.womanaroundtown.com/sections/living-around/simple-tips-for-decorating-your-nursery
I like this one as my favorite. I choose this one because of how the primary colors brighten up the room. It brings more life to it then it just being pale.
http://www.myhomeideas.com/room-galleries/kids-room-color-10000000733257/index.html