How to create cool kids rooms (without the clutter)

You want to throw all the toys out of the window you say? Momma, I hear you. I remember the days, before having kids, when my husband and I would look at each other in horror after visiting a bomb site at a friend's house. "I can't believe the state of their house. Honestly, the amount of plastic toys...surely they could tidy up, right? If we ever have a family, I will never have so much junk." *laughs hysterically*