I have a great recipe for homemade hot fudge. You start out with a can of plain old Hershey's chocolate. It's alot cheaper to make this stuff than it is to buy the jars of hot fudge ready made AND it's delicious! Let me know if you want it.
You could put the ice cream in little baby pools and fill them up with ice. We've done that for cans of pop at summertime parties before. It works really well