I've never done it, but I've seen what Mr. Stout is talking about. You can make it look really sharp by doing different layers from light to dark. Not sure, but I don't see why you can't go dark to light if the paint is dry.
Start with your base paint. Lay some leaves/sticks etc. on top and spray again. You can do this several times with different colours. Comes out real nice.
Or like Mr. Stout just said, just put a leaf or whatever and spray it.
There was a film dipped (I believe) ACS-CX on here a day or two ago. It looked real sharp! Maybe it will show on this thread.
I will see if I find it and bring it to the top.
Cheers,
Donavan