Microwave butter and marshmallows in large microwavable bowl on HIGH for 1 1/2 to 2 minutes or until marshmallows are puffed. Stir in gelatin until well mixed. Pour marshmallow mixture over popcorn and candy corn in large bowl. Mix lightly until well coated. Shape into 15 balls or other shapes with greased or wet hands. Wrap each ball in plastic wrap and tie with raffia or ribbon, if desired.