I don't know what one is "supposed" to use, but I used Acrylic Paint, in 2 different brown colors (941 Acorn Brown and 959 English Mustard ((I only made a few with the latter))from Michael's, brand Folk Art), that I watered down, and painted them on with a very, very small brush (for the larger ones), and a toothpick (for the smaller ones).
Here is a "How to" guide, but I think once you start on it, you don't really need a guide.
It's really fun, and very hard to mess up as you can whipe them off if you don't like the way they look. Let me know if I can be of any more help.
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