hey melissa,
i've seen it done tons of different ways, but the easiest is a light bulb wrapped in something....we're not religious at all, and we'ld be breaking the glass for our parents....so i think we're going to use a colored bulb wrapped in a cloth napkin and after, put the glass pieces into whatever we use for our sand ceremony...our ceremony will be on the beach, so we have to figure out what kind of hard surface to put down in order for it to break......
oh some people take the glass and have it made into the outside of a mezzuzah (sp?)....i'm sure you could do lots of different craft-like things w/ it - melt it into part of a menorah base, sedar plate, etc.