Wilton has a product called luster dust in silver. Dust this on with a small brush, or add voka or lemon juice to use it as a paint. Hope this helps!
What are you trying to accomplish? Are you trying to color all of your fondant, or are you wanting to color decorations?
If you want to color a whole tier/cake, I would recommend airbrushing. You can buy metallic airbrush color. If you don't have an airbrush, you can buy canned metallic spray color.
If you want to paint metallic color onto a decoration, you can just buy metallic luster dust and mix it with a little bit of vodka.
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