Fundraising ideas for high school kids to buy in school to donate money to cancer research?

I'm in high school & I need a fundraiser idea to sell at school that kids in 9th through 12th grade would like to buy to donate money to cancer research. We can't sell any foods or candy because it's against school rules. I need something kids will like, for example last year we did pink hair extensions for girls & made alot of money. Thanks