Quote: "I believe there is a program called Tattoo that does 3D painting. I have no idea where the owners site is, but downloads may be available on the net somewhere."
Tattoo 3D
To the Author of this post. Applications that allow you to paint directly on the model almost always require you to unwrap the model first, so if you don't know that then get learning it first.
Regarding Sculptris, I followed the development of it and helped with testing for a while, awesome piece of software and I often find myself working in it over ZBrush.