Making an ornament would be a big hit at the retreat! I think I would add something else inexpensive so as to not outdo everyone else. Thread or needles or pins or something simple would be perfect. They aren't going to care about anything but the ornament anyway. And, you don't know if they go overboard on the $5, so try not to. Chocolate is a great addition. But it sounds like you make ornaments and if I was going to that retreat, I'd want to get YOUR gift!!! A homemade ornament is totally the best gift I could think of.