craftgrrl | lightbulbs and bottle caps

i have a tendancy to keep burnt out lightbulbs. i have one hanging from a piece of wire over my desk, and i have one that is on the head of a robot that i made. i have also heard that you can fill them with cement, let it dry, then break the lightbulb so you have a nice piece of cement shaped like a lightbulb. but being that i have a lack of cement.. does anyone know what else one could do with lightbulbs? it'd be pretty cool if i could substitute the little things on top of bedposts (finials?) with them, but i'm not sure how that would work.

also, some people gave me the idea of making pins out of my keyboard keys, which i thought was really cool. from that, i got the idea to make pins out of bottle caps (another thing i have an excess of). i haven't made any yet, but i thought i'd share the idea.