Obviously, this goes for girls too. If you have the space, it's a nice to go up a size for your kid's bed. I have to play devil's advocate here & point out that the larger size bed may last until college, but oh-honey-NO NO to the rest of the room! Let the kid hit his pre-teens & I'd think that he would be tired of the decor.
But that's just me & I'm comfortable with being mean.
♥ - Kat.
[image from a 2002 Kids' Rooms magazine]