TO MAKE SPIDER BASE: Spray a 10x15-inch jelly roll pan with cooking spray. Melt butter and marshmallows in a large saucepan over LOW heat, stirring frequently. Remove from heat and stir in vanilla. Add cereal; mix until well coated. Spread mixture into evenly into prepared pan. Cool (about 8 minutes); form mixture into balls (about a half cup each). TO DECORATE: Slide 8 small pieces of licorice under each to form the spider legs. Use frosting to “glue” Craisin® eyes onto spiders. Makes 12 spiders.