[ktb]

From what I know about the speakeasies they were an underground club basically full of mobsters and the rebels, and you had to have a password to get in. Something cool might be to have an image of a flapper type girl "whispering" the name of your fraternity like shes trying to get into your party.
Researching that era and the speakeasies might help with ideas, and you can look up images too to see what is already out there.