[Sciencewoman]

It might be too late for this, but a cute idea I've seen is having buttons made up that sisters can give to guys on campus before recruitment starts. It's a popular thing to wear these on backpacks, at the campus where I advise. Fraternities and sororities do it...it's a nice all-around PR move and you will see students with multiple buttons for various chapters. Usually, they're easy to read and simple, like Go Gamma Phi, etc.