Melt butter in large saucepan over low heat. Add marshmallows and stir until melted and well blended. Cook an additional 2 minutes, stirring constantly. Add food coloring (other colors can be substituted in additional batches). Remove from heat and add rice cereal until well coated. With buttered hands and spoon from into nests by pressing against muffin or cupcake tins or half pound butter tubs. Refrigerate until thoroughly chilled. Fill with jelly beans o Easter eggs.