hi there, i use cocoa butter and lustre dusts, there is a painted cake in my pics done with this method 
i find it a lovely medium to use. hope this helps x
It depends on the effect you want. Take a look at my latest cake (with a garden theme)
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1442494
... I took a dark moss green (see the grass blades) and added a small glob on the end of a toothpick to about a teaspoon of vodka, and mixed it up. But you can add as much as you want ... I would suggest taking a piece of fondant the color of the one you are going to use and painting on it first. HTH!
-Emi.
I paint on fondant all the time. I use gel colours and vodka. I don't have a ratio for you as I just mix them until I get the consistency that I want. However, it's best to administer the vodka a little bit at a time as it's easier to add more of that than to take it away. I use an eye dropper for the vodka so I have more control over how much comes out. I have tried to paint with straight gel colour (no diluting) and I found it very goopey and thick. It didn't look nice (streaky) and took forever to dry. Good luck!
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