What are good themes for elementary dances?

Hey, Theme dances are always a good time, I used to work at a summer camp for 5 years and we had at least one every session. Of the themes you listed I would go with ether the pirates or super heros. Sock hops just aren't fun for kids these days, they don't get them. Pre-historic could be fun, but you wont get very inventive costumes really. With Pirates or super heros, you can really get imaginative with a costume while keeping appropriate. Some themes that worked well for me that I have used have been beach party themes, Colorful theme (have them dress in their favorite/s colors and you can have odd colored food and such), and another popular one is like a movie theme, where you dress like your favorite actor or actress. That last one might not be great for the age group but its somthing to think about. Those are my thoughts on it, but from your list deffinatly pirtates or superheros.