Microwave butter in 4-qt. 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 and mixture is well blended, stirring after 45 sec. Add cereal; mix well.
Shape 1 cup of the cereal mixture into ball, using wet or greased hands. Repeat to make a total of six large balls. Shape remaining cereal mixture into six smaller balls, using about 1/2 cup of the cereal mixture for each ball.
Place one small ball on top of each large ball to make a “snow person.” Gently press balls together to secure, using decorating icing to help secure if desired. Decorate as desired, using decorating icing to attach desired decorations to snow people. Makes 6 snow people.