Mika, my 7.5 yo, is selling the first necklace she designed and made all by herself. It's made of azurite and copper (I think) and it's much nicer than the picture shows. Indeed, I wanted it for myself but she is "saving" to buy herself a DS, or a dog or a TV (it changes by the minute) and she seems to prefer the money to her mommy. The necklace is 22" long and it's quite well made for someone her age. As I said, I'd like it for myself. She wants $10 for it (plus shipping if you're not in San Leandro).
If this doesn't work I'll probably try etsy, but then I'd have to create an account :-(