At least 1 day in advance: Make drop flowers. Using royal icing and tip 224, pipe 10 rose drop flowers with tip 2 centers for each treat on waxed paper. Let dry overnight.
Bake 1-layer sheet cake. Cut petits fours using smallest round cutter from 101 piece set. Ice lightly in buttercream. Place cakes on cooling grid over drip pan and cover with quick-pour fondant icing. Let dry.
In buttercream, pipe a tip 5 mound. Attach drop flowers to mound. Pipe tip 3 outline stems. Pipe tip 3 bow.
Drop flowers are a great way to add flowers quickly. Pipe drop flowers in buttercream directly on your cake, or pipe in royal in advance and place your flowers anywhere. Flowers will be sharper in definition when piped in royal.