[mx] Help with coloring book

I have 2 questions. Is it very hard to do thse coloring book things like for kids. You know when you have a picture and on the side you have color swatches. You click a color then click on a section of the picture and it colors that section that color?

My next question is can anybody recommend a tut or know where a tut is for this. Or for that matter a book that has a chapter or so on it. Doing a kid website anf they want one of those.

Any help greatly appreciated.