Jam in reject prints to seal one end. Apply several heavy coats of Glamour II. Use as flower pots. Or lay them on the floor and roll them underneath your back for a great massage.
Otherwise a couple times a year I take them down to a non-profit public arts center along with all my scrap Gatorfoam trims and canvas short-ends. They love 'em, great bases for sculptures. Senior centers would probably like them too.