Leave the toys out, I say.... Clyde and I made a simple lego house one day. The next day it was taller and more ornate. Then the blocks came out and there was a simple ramp. Later, the ramp extended and a bridge was added. After that, a curvy walkway to the roof was added. If you make your kids put everything away everytime they play, you're really limiting their creativity. This is what I tell myself when I walk around my house and see toys out, forts half built, and art supplies strewn about. There's probably some truth in it and it makes me feel better about the lived in look of things.
3 hours ago