High School Fundraising Ideas- Please help!?

I am the Treasurer of my high school, and I want to start a fund raising project so that I can help raise money for my school. We have a big student population (~4000 students) so I want to try to get the most students to participate. Originally, I was planning on collecting Box Tops 4 Education, but unfortunately I found that the Box Tops 4 Education Program does not support high schools. So please give me any advice or suggestions/ideas regarding about fund raising. I really want to do a great job as the school's treasurer, so any suggestion or comment is helpful and much appreciated! Thank you!