Place colored sprinkles, sugar or coconut in small bowl. Cut several marshmallows crosswise into 4 slices with sharp scissors. Press 1 of the cut side of each marshmallow piece into colored sprinkles to coat. Place coated side up on baking sheet. Repeat with remaining marshmallows and sprinkles to makes 120 marshmallow petals. (For variety, use different colored sprinkles, sugar and coconut to decorate the marshmallow petals.)
Tint the frosting bright green, using 1/2 teaspoon green Food Color and 4 drops blue Food Color. Place the green-colored sugar in a shallow bowl. Spread top of each cupcake with green frosting. Roll the edge of each cupcake in colored sugar.
Arrange 5 marshmallow petals on top of each cupcake to resemble a flower, pressing the marshmallows into the frosting. Place a gumdrop in the center of the cupcake to complete the flower.