I found this link, it's not what I was thinking about, but it's start. http://www.visualmuse.net/colorsketchtut.htm You can also go into "Effects" and "Artistic Effects" and use "Colored Chaulk". I'll post the other method if I can find it.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi