Here are the fundraisers we did in college, some more successful than others:
Christmas cards - Wrote a team newsletter and sent it out at christmas asking for donations. Send to alumni and current family members. This usually got us about $3500. Include tax receipts.
Handed out promo cards and t-shirts at a football game - Made about $1500 and very easy
Docks and lifts - Helped another team, not sure how much they made
Signed up people for credit cards - This one was horrible to do but we made $4k in one day. I don't know if you can still do that.
Had a formal - Rented out a big boat and had a dinner cruise with team, friends, alumni and parents. Had sponsors give raffle prices like new gloves etc. Made about $1200.
Dues - Largest contributor, about $8000 per year.