Remember when you were a kid playing outside during the first winter's storm. The snow is falling you are making a snowman and Mom is inside making hot cocoa for you and all your friends. Remember how that snowman looked when you finished? Pretty horrific, right? I think it would be great if you could build a snowman similar to building a sandcastle. With three different sized hollowed out circular "pails" that you could fill with snow, pack down, and empty on top of one another.
When you finished, Mom wouldn't be lying when she told you it looked great.
Reward: A roundtrip for two anywhere in the world.