A fundraiser that my chapter just did was a football squares pool for the Super Bowl, with a template set up like this one...
http://www.numberstemplates.com/2007...pool-template/
If you don't know how this works, you would win based on the 2nd digit of each team's score at the end of each quarter. Using the example template, if your name was in the first square, you would win if, let's say, after the 1st quarter, Alabama had scored 13 points and Auburn had scored 22. Or if Alabama had scored 3 points and Auburn scored 12. The girls sold each square for $5 and the prizes were gas cards equaling $10 after the 1st quarter, $20 after the 2nd, $30 after the 3rd, and $40 after the 4th. The sqaures were really easy to sell, especially being in PA with the Steelers in the game.
But you could do something like this for any sport. And March Madness is right around the corner. That's an option. Or raffle off some kind of sports item from a professional team in the area. Jerseys are always a good idea. People will gladly put up a few bucks if they think they might win a jersey worth $50+