Cool idea, shame I'm about 8 pages too late.
Anyways, not to try to act all high and mighty here, but for those of you thinking about sending stickers or a used beanie, please don't. Personally, I'd be pretty ticked off. The cap is $25 - not an enormous amount, by any means. Please take the time and effort to make this work - it could make someone's holiday!
And like I said, not trying to act like the big dog here, but YOU agreed to sign up for the event. Take responsibility and make it an enjoyable experience!