I am working on silver gumpaste right now, and I would think it would work the same on fondant. Well, actually I was going for a chrome look, but the principle is the same. I mixed three colors: pewter, nu silver and super pearl. Very nice effect.
I tinted white gumpaste a medium gray, then mixed luster dust with vodka and painted it on. I had to keep adding drops of vodka because it dried out quickly in the little pot.
I didn't feel like the painted on mixture had quite enough depth, so once dry, I brushed the same mixture of dry luster dusts over the items, and they turned out great.
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