Center Piece Ideas???

Hello...I`m in high school and I`m looking for ideas for our prom. Something that looks "classy" yet doesnt cost alot. Any ideas? We want something so each person at the table would have something to take home w. Them. I was also thinking about something w. Water in the middle w. Like floating candles or something. Since it would cost less than flowers. That could be the "center piece" then have "plastic wine glasses" fro people to take home. Well let me know wat you think. All ideas are helpful!!!
Thanks so much!
Jessica