Those are great Ldennis! I wish I got the wet saw my Great Uncle had as well, I have a bunch of geodes I'd like to cut.
That p-wood you have is really unique. I dig the idea of cutting petrified wood into bookends. Especially if you can book match them. They work great, are always on display that way, and functional. One of the greatest and most unique gifts you can give to anybody who has a shelf with books on it, which is mostly everybody.