Your challenge, if you choose to accept it:
Pick any book from your readathon pile and write a fake synopsis based solely on the cover. The synopsis does not have to be related to the actual book at all, just the pretty, pretty cover.
I'm going to do it for my current read, 'An Instance of the Fingerpost' by Iain Pears
In a time before time, a book was born. Through the centuries it has passed from hand to hand, from wing to wing. But only one can uncover its mysteries. Will the price he has to pay be too great, even for him?