Line muffin pan with baking cups. Fill 1/2 full with your favorite cupcake recipe or batter from a mix. Bake according to recipe instructions. Cool completely.
Tint small portion of buttercream icing dark rose; tint remainder a lighter shade of rose. Spatula ice top of one cupcakes dark rose; spatula ice the remaining cupcakes light rose. Sprinkle with colored sugars.
Arrange cupcakes on foil-covered cake board with dark rose iced cupcake in center, light rose iced cupcakes positioned around the center. Cut a stem and two leaves from green construction paper. Position stem and leaves around cupcakes.