These can be printed on to highlight the veins of a flower. This is a new category in artificial floral arranging and this material looks best when the flower it's imitating is tropical and rubbery-looking in its natural state. Combining some with the other two adds texture and airiness. Silk and dried flowers are always a winning combination. There are sealants and preservatives for dried flowers to make them easier to work with and more durable.
Cleaners are also available that dissolve dust on artificial flowers.
Look for artificial berries to use in arrangements, as well.