My son is still very much a baby at 18 months, but recently, he is showing signs of readiness for a real bed. No more crib. So we're in the process of switching from his sweet white crib to a twin. This transition is a great excuse to update some of the decor in his room. (But who really needs an excuse?) While looking around for inspiration, I found these great rooms suitable for and designed for kids. Not at all childish, but rather elegant and playful.