Well, we do tend to focus a bit more on the younger set here, but hey- they're all growing up all the time, so it's not a bad idea to think about what their rooms will look like when they get a bit older!
(Note: Include a pic of your problem and your question gets posted first. Email questions and pics with QUESTIONS in subject line to: nursery(at)apartmenttherapy(dot)com)
The ages Chris is asking about are commonly called the "tween" years. And the furniture/decorating market has definitely taken notice that tweens (and teens) like decorating. Kids are running home from school to watch Trading Spaces. It can be both fun and challenging to help them decorate their rooms. Fun- because they want to express their personality. Challenging- because they REALLY want to express their personality!
Definitely think about a place to hang things on the wall like PB's Style Tiles. Kids can have an ever-changing collage of their artwork, photographs, or posters. This can easily evolve as they grow older.
Ikea and Target are also great places to find items for this age group. Also, see our post on dELiA*s , a great resource for tweens.
Anyone else have any suggestions for Chris?