Melt butter or margarine in large saucepan over low heat. Add marshmallows; stir until melted and mixture is smooth. Remove from heat. For colored eggs, add food coloring to desired shade.
Immediately add cereal; mix lightly until well coated.
Spray hands with nonstick cooking spray. Working quickly, shape into 18 eggs. Roll eggs in sprinkles if desired. Cool completely.
Place each egg on a 12-inch sheet of plastic wrap. Gather plastic wrap at top, twist to seal and tie with ribbon.
Decorate empty egg carton as desired and fill with wrapped eggs.
Servings: 1 1/2 dozen