Twilight Birthday Party?

Okay, my birthday is coming up and i want a Twilight theme. It is a boy and girl dance party. Most of the girls have read the book. I am not going to go any games or crap because its a dance party. I was wondering about like a twilight cake and decorations. I was thinking about decorating my basement the way that Alice does for Bellas party but that will get expensive and messed up a lot. Or i was thinking doing a lot of red, white, and black streamers and twilight posters. Any ideas?