With the holidays and exams right around the corner.... sell things in the dorms... could be as simple as candy canes... sell them for a quarter each... or 50 cents... or any sort of chocolate/junk food that all college students live on at the end of the semester.

Do a gift wrapping service.... see if you can do it at the mall for a day for "tips"

If you have an active student council in your dorm, see if you can "auction" yourself for services... the legal sorts of services ... dorm room cleaning, trash take-out, etc.

Sell your books, or get people to donate their books to you to sell at the end of the semester at the bookstore.

Ask your family/friends not to give you gifts for the holiday but to pledge their gift in cash to support your cause.

Sell "bells on a string" for people to ring in the holiday with...