edit: I notice, above, that I've caused Bob's and George's posts to "x"-up. This happened when I relocated a couple of photos in a different album. Sorry, guys.
That is another great one! I think Bill, that you should find a good printer, frame some of these, and get yourself a booth at one of the festivals (Whitesbog, Wells Mills, Batsto), just to have some fun and see what happens. Better yet, get about a dozen of them together and to see if there is a market (with little risk of loading up with 50 of them and not selling them), have a group that already has a booth sell them and you give them a percentage of the profits. I have a conservation group in mind, but I'd have to consult with them.
PS: the worst thing you can do is overprice them at first, wait till you get famous. Go easy.