Gamma Tau (WGa) does a Rose and Raffle every year. I know that the roses are sold, lol, not sure about what the raffle part is but if you are interested, let me know and I will put you in connection with the Philo Coord!
They also raised a bunch of $$ with the Rock-a-thon (rocking chairs in front of the library) and bowl-a-thon.
They did quite well with a golf tourney for a couple of years or so and then quit. Another sorority now has one and does well.