I've watched Duff's show but I can't remember the cake you are refering to right now----(senior moment-lol). However, if you look at my Valentine's Day cake, I airbushed a fondant-covered cake with red food coloring. I piped the border with royal icing, and dipped a paint brush in vodka and then dipped the brush in edible gold dust (available at cake supply shop), and painted the border. You can also use this technique to create a metallic design on the caketop.
Hope this helps!!
We have a recipe for piping gold and silver on cc here:
http://www.cakecentral.com/cake_recipe-2039-28-Piping-silver-and-gold.html
check it out!
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