It is kinda of selling, but we do final grams at the end of every semester. we send out letters to parents (we get them from the registrar). We charge something like $20 a piece. they have food, toys and some stress thingy. our cost is like $4. we make like $1200 a semester. We deliver them by hand. Just make sure you get addresses and phone numbers from parents. we use excel to keep them straight. parents can write their own message. frosh parents love it. they are so worried about their kids. We have a small college (1100) and it is residential. so that helps but you could maybe do it somewher smaller.
also- in HS my track team at Valentines day organized the flowers that were delivered to the HS students and staff. We got a bit of money for it. we did delivery's and sorted. some flower shope may let you help deliver in the dorms. that's just a thought.
Tau Love and Mine