These are the only things in my jewelry line that I did not design myself, but I loved them and had to turn them into earrings!!! 
These are tiny fire hydrants that I had cast from a very old Cracker Jack toy.  I think I am dating myself, because I am not sure they even still put toys in Cracker Jack boxes!!! 

Fire hydrant is approximately 1/4" in diameter and 5/8" high including the bail.  They are on french wires.  Sterling silver.