When I did more offshore boating I'd use my expired ones to start campfires, or on the 4th of July for added pyrotechnics.
I used a couple to start a flag retirement ceremony or two with the Boy Scouts.
Also good to leave in your car/truck for roadside hazard use. The expiration date is just for the Coast Guard. If they are not all swollen up from moisture they are good for much much much longer than the date.