What kind of contest would you like?

Now that all 4 of my Druids books are out I'm thinking of having a contest. My question to you is, What kind? There are a lot out there: scavenger hunts, leave a comment on a blog, those kinds of things. I want something different...but what? Fix the collapsible panels on my website, win a book doesn't sound too intriguing! (Though I'd be grateful, they're driving me bonkers!)

Rules: Must pertain to me, my Druids books, and have a realistic prize. The person whose contest I pick will receive thei