Hi Darcy: My cousin held a "jeans day" at the high school where she taught. The staff each paid $5.00 for the privilege of wearing jeans for a day. It didn't raise a whole lot of money, but it is one thought, and it is something easy.
We do this at the company where we work. Typically $5 for a day, or $20 for week. Usually it is done around Thanksgiving, but any time works. Not only does it raise some money, but it gives a break to the employees, too!