i love this hand print ghost idea. i think it would be fun to cut them out and make a banner out of them. you would need them to do lots and lots of hand prints, but what kid doesn't want to plany with paint. Halloween ideas, these handprints are genius.
Gummy worm ice cubes - infest drinks as they melt. Put the worms in an ice-cube tray, letting them stick out of the top and sprawl over the edges, and fill tray with water; Add cubes to a clear beverage, and watch as kids squirm with delight.