Where can you find interior design ideas for a 12 year old girl's room?

The best way to come up with a great feature wall for a 12 year old girl's bedroom is to get her involved. Take her with you to the store to pick out some new bedding and accessories. Have her choose the new accessory that she likes the best and use it as an inspiration piece for the feature wall. Pull your paint colors from the piece and possibly a theme. The feature wall could be polka dots, flowers, even animal print... the possibilities are endless. There are vinyl wall art sets that come in all kinds of themes that would work well in a tween girl's bedroom. When she gets sick of them or outgrows them they easily peel off the wall without damaging the paint.