I've never heard of this before, but what a fabulous idea. I love it! My boys are too old for this now but I would have loved to have done this when they were younger. You could probably do this with decorations as well. I know every year there are at least a few decorations that I am done with and they end up in a garage sale. Not to mention how many of us have bought decorations in a garage sale. so instead of buying in a garage sale just swap.

__________________
Linus: You've heard about fury and a woman scorned?
Charlie Brown: Yes, I guess I have.
Linus: Well that is nothing compared to the fury of a woman who has been cheated out of tricks or treats!