Thanks for the ideas, everyone! Let's keep them coming!
I actually have a good one to share. Last year, on Valentine's Day, we set up a "kissing booth" in the music building(we're a music sorority). We charged 50 cents for a hug, or a dollar for a kiss(on the cheek, or a few Hershey's Kisses). We made almost 200 dollars! Guess it helps that our chapter has some real hotties.