I am starting to make a lot of fondant flowers and would like to be able to set them on a phony cake for display so that I can show how different flowers (and different positioning) will look.
I have the sytrofoam dummy cakes but would like to put something on it that will look like WHITE fondant or royal icing!
Any suggestions??

I thought people used royal on the dummy cakes. I've also heard of some sort of plaster being used.

Since this cake is going to be sitting around for a while I guess I'm looking for something non-edible.

Like Dawn said you can use the plaster or you can use Royal Icing Matter of Fact you can even use the Rolled Fondant I would use the Cheaper of fondants meaning the premade from Wilton.

I have many dummy cakes for display. I cover them with fondant , and they last me years. I reuse them by taking the decorations and adding new ones.