We've come up with some incentives for Pinup Truck, which include some unedited pics from the unseen second part of the set that we didn't publish:
5 or more votes: 1 pic from the set and 1 not from the set
10 or more votes: 2 pics from set and 2 not from the set
20 or more votes: 3 pics from the set and 3 not from the set
More than 25 votes will get you lots of pics from the unseen hitchhiking set. And some from the set as well.