In large saucepan melt butter over low heat. Add marshmallows and stir until completely melted. Stir in food coloring, if desired. Remove from heat.
Add KELLOGG'S® RICE KRISPIES® cereal. Stir until well coated. Cool slightly.
Using buttered hands shape cereal mixture into eight spiders. Cool. Decorate with frosting and/or candies. Best if served the same day.
In microwave-safe bowl heat butter and marshmallows on HIGH for 3 minutes, stirring after 2 minutes. Stir until smooth. Follow steps 2 and 3 above. Microwave cooking times may vary.