I would say, don't even bother. It's probably the picking up part afterwards that's got you frustrated yes? Check out the question, "At what age did your children start cleaning up their toys without help and without being asked?" for some groovy ideas. The way I see it, if your kidlets know they'll have to put ALL their toys away after they're done, maybe they won't take out so many to begin with....here's hoping, good luck!