Prepare recipe as for skulls, adding orange icing color to the melted marshmallows before stirring in cereal. Cut pumpkin shapes using a 3-inch cookie cutter. In a bowl, microwave 1/2 cup chocolate chips and 1/2 teaspoon vegetable shortening for 10 seconds, stir, and repeat until melted. Spread chocolate on a piece of wax paper, refrigerate to set, and cut cat shapes using a mini cookie cutter. Press chocolate cats onto pumpkins (they'll stick!), and pipe cats' eyes using green icing.