Yes, gel colors thinned with vodka or a clear extract. Some people also paint with gel color mixed with crisco...I've been meaning to try that but haven't yet.
Crisco is kosher. It's a US product, so if you live somewhere else you might find it called "vegetarian lard". It works pretty well to paint with extracts and gel color, it's kind of a watercolor effect. Mixing the gel colors and crisco is supposed to be more like painting with oil paints.
I forgot, you can also mix white icing color with gel colors to get opaque paints. You can't thin those with extracts though, alcohol makes the white color break down.
People also paint with petal dusts but those can be kind of expensive.
The only way to paint buttercream is with an airbrush, as far as I know. If you want to put a picture on buttercream, you could do a frozen buttercream transfer, where you make a picture with different colors of buttercream and freeze it, then put it on your cake. The gel colors are the ones that you tint frosting with.
The people who've posted about it were just using a bit from the tub, mixed with gel colors. After I get my kids in bed for the night, I'll mix a little and see how well it works...that way you don't run out and buy a tub and then it doesn't do anything. I've painted a lot with gel colors mixed with vodka, so I should be able to compare the two methods 
Yes, gel colors thinned with vodka or a clear extract. Some people also paint with gel color mixed with crisco...I've been meaning to try that but haven't yet.
i've never heard of doing this. wouldn't it stay tacky or... greasy?
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