Being both an organizer and parent educator, I get lots of questions about kids rooms. Here are my thoughts.
1. Do not spend too much time angsting about them or decorating them. Every few years what they love, are passionate about and ABSOLUTELY can't live without changes. So ditch the matching wallpaper and thematic rugs, give the room some good bones - a sturdy bed, ample book cases and plenty of empty and open spaces.
2. Focus on having only as many objects as a kid can pick up in 15 minutes. (What?). Yes, it's our job as leaders in our families to edit our kids rooms down to 15 minutes to picked up.
3. Doors on cabinets and cupboards can help a room get ship shape in 15 minutes without being perfect.
4. The bonus tip is to decide that only a few things live in the kids room. Books, stuffed animals and sleeping accoutrement are my personal favorites. It isn't that legos and board games and crafts don't creep in, it's that when it's time to clean up it's very easy to evict the squatters!