I really really like this idea! As a previous WRX owner, the Subaru forum did this as well. See their thread
HERE
One this they do that i think might be kinda neat here are THREE different challenges ranging in difficulty from easy, medium, to hard.
Examples of this could be
Easy: Bike in your garage
Medium: Bike in front of your LBS
Hard: Your bike with Santa on it
Now, these are just examples and the three levels is also just a suggestion. Sometimes having the three levels allow for people to get more creative with challenges.
But like i said, i dig the idea and think it could be fun. Just wanted to throw out a little more to it. Or, we could see how this goes then maybe add the different levels later.
.Chris