I did a quiz where you had to guess my end of day chipstack for day 1 of the big Vic event. It was free to enter if you have a Sky Poker account and Sky Poker gave £25 to the winner.
I'll do another one today if my micro-stack gets big enough to spend the time and effort on it and I last more than 5 minutes. You'll need to check out
@senseichanning on Twitter to get involved.