Photo Day!
I got the fun idea from a fundraiser we did back in college, but the basic idea was having a whole day where anyone could sign up for headshots (or just normal pictures) taken for a real cheap price.
Then you make them a CD and put pics on a website where they can order prints, and their friends and family could purchase them as well. Some folks were professional, and some where just sticking with local theater, but they all turned out gorgeous! Enjoy!