This was the other piece I did, using an old binder clip and a watchmaker's vial. The clip has two prongs at the back so if you had a shirt with a breastpocket, you could slip it over the edge of the pocket to wear it. I sandwiched the moss between the acetate "glass" the binder clip came with and then attached the vial to the outside.
It's interesting the kinds of art materials mother nature provides. I can't wait to go poking around again!