How about hot gluing one to the end of a pen that's been chewed on
This crafty person makes great recycled jewellry: there's another on pg 8http://amyjewelry.com/index.php/green.html?p=7
Put a little dirt in one & plant a small flower in it
Hot glue the open end to a circular magnet & use it as a fridge magnet. Or glue
the magnet to the side and put a couple little crafted flowers in it, maybe decorate up your boring work filing cabinet.
Or hot glue a tiny "earth magnet" they're tiny, but strong, to the side like above, but stick it to the front of your stove as a way to hang your oven mitts on it. Or
stick it to the side of your range hood to hang a kitchen gadget or stick to the side of a metal medicine cabinet and use it to hang a necklace on so it won't slip from the edge of the sink & down the drain by accident (and you can put your tiny stud-like earrings inside the little "cup" too)
Create a charm bracelet using one as a charm
I saw a picture on the internet where someone made a bead- type fringe on a
jacket & at the end of each string of beads was a thimble & she said she liked it
because the thimbles would jingle when they'd bump together.
How about a key ring charm? Poke the hole in the top and run a piece of wire thru a bead & feed the wire up thru the hole. Attach the wire to the key ring
It would be easy to poke a hole in the metal & plastic ones using a long, skinny framing nail & hammer & just go in thru the underside. The ceramic ones are much harder to drill holes into, so unless you plan on doing more, don't bother drilling a hole, use super glue instead to attach a small loop ring. Ceramic drilling requires you to use a diamond or carbide drill bit (kinda $$).
Have fun & post pics of your finished projects!