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.
Two bundt cakes make a pumpkin! The stem is a green ice cream cone. You could use any ice cream cone and frost it with green icing. The cakes can be any flavor. Use food coloring to make the orange icing. I would probably frost the whole cake.