Hair chalking: dampen the strands you want colored, use pastel colors of chalk and rub on the hair strand. Washes out when you shampoo. Also saw where you can fill a bowl with water, put the chalk in to saturate and use gloves to apply wet chalk to hair.
Several weeks ago, I borrowed this book from the library - The Curly Girl Handbook by Lorraine Massey. I was in desperate need of a haircut, was wearing a lot of ponytails, the weather was humid and atrocious, and I had read about this "Curly Girl Method" and figured I'd see what it was all about.