We just did regular trick or treating, and the kids traded in what they couldn't have. Dd (8) said "This is so much fun! Its just like playing bank!" (Of course, she hasn't figured out that anything she doesn't trade for will probably end up hers anyways...what am I going to do with glow in the dark bats?)
And next year she wants to dress up the day after Halloween and go trick or treating at a retirement home...to pass her treats back out. I think its an awesome idea, I just don't have my head together to do it this year. (I'd have to find one, call to get an okay, actually get her there...)