I have seen many cakes be decorated with paint. I love to look but do not know what kind of paint to buy or where to buy it? I am assuming you would paint the cake like you were painting a canvas, but if there is more to it than that advice would be much appreciated! Thanks!
Here's a previous thread, so that you can read about it:
http://cakecentral.com/cake-decorating-ftopict-653558-.html
You use the same food color as you would to tint your icing. I have seen some mix it with a little vanilla extract, vodka and so forth where the alcohol evaporates and I have a cook book that says to mix with coco butter, however, I have also seen some do it with just wilton colors, but it remains tacky.
I love to paint on cakes (see my photos for some with painted grass on) i use gel colours mixed with a little vodka and i also use edible dusts, again mixed with vodka. paint as you would on paper and leave to dry. good luck!
Hi, I recently had a manchester city football crest cake to do. Soooo complicated I decided I'd have my first attempt at painting!! I used sugarflair paste colours or lustre dusts and diluted them with pure vanilla extract. It's then just like any other painting. It worked great for me and I was really pleased with the outcome!! It's also pretty easy although I found a few sheets of rolled fondant to practise on and get the hang of consistency helped me. Good luck 
I've done a little painting on cakes. I've even painted on buttercream. To do this, it has to be a crusting buttercream and you have to be very gentle when painting, but it's possible. I second the above in that I have mixed Wilton colors with just a little vodka and you just paint it on with decorator brushes. It really is fun! I have a pink and black leopard print cake in my gallery that I painted and it's all buttercream. 
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