Decorations, such as ready-to-spread frosting, assorted decorating icings and gels, assorted candies
Line 15x10x1-inch pan with foil; lightly grease foil.
Microwave butter in 4-quart microwaveable bowl on HIGH 45 sec. or until melted. Add marshmallows; toss to coat. Microwave 1-1/2 min. or until marshmallows are completely melted, stirring after 45 sec. Add cereal; mix well.
Press cereal mixture firmly into prepared pan. Cool. Cut into assorted shapes with holiday cookie cutters. Add decorations as desired.