Brickfair had X/"Ten" for it's theme this year due to it being the 10th anniversary. I initially thought of doing Big Bird with the letter of the day. My kids and wife felt it should be Cookie Monster eating the letter of the day. When I built the 'X' my oldest thought I should add black pieces to make it a chocolate chip cookie.
It was nominated for the best theme category. It didn't win but I'm happy to have a nomination.