yeah, put them in a book till they dry, and make clear plastic molds with them inside, sell'em at the swap meet as coasters. or maybe like some smaller fan key chain molds or paper weights. people love to buy stuff like this. some of the leafs during late flower would be lovely as well.
I have thought about after booking and drying: mounting them on a canvas, with a clear coat, and putting the strain name and year on the bottom.
you cant leave(leaf heh) to long of they turn to and olive green-n-brown shade. if you get it just right, they will be super green and have great contrast on white.