We love seeing what is in caches. I carry a baggie of stuff to leave if there is room. On a Star Wars theme cache I left a Star Wars Angry Birds bottlecap. In a cemetery cache I left a little cross on a mini clasp. Some other things we have left were, rubber ball, mini flashlight, small baggies (jewelry bags)Handmade pins, locket charms, anything I think someone would find cool to find.