Now that your flowers are dry they will keep their shape but they are a little fragile and you might even want to make extras. Some may chip but you can put that part in the frosting a little to hide it.(depending on how bad the chip is)They will have flour on them so you can either blow on them to get it off or take a soft paintbrush to dust the flour off. Dip your paintbrush into your lusterdust and lightly "dry-paint" the middle of the plumeria. Or as you desire. Now just place your beautiful flowers on your cupcakes.
NOTE: The last 5 pics are of real plumerias. As you can see they come in all shapes and colors so you cant go wrong.