How to Color Hair with Chalk - Hair Chalking

Awhile back I posted a tutorial from The Soap Queen's site on how to make hair chalk.  If you liked that one you may want to check out Go Planet Earth's post on How to Color Hair with Chalk - Hair Chalking.  This post includes a recipe and how to apply the chalk to hair.  Has anyone applied hair chalk to their hair before? The colors in the picture look really great in blonde hair but it might not work with different color of hair.  I guess one would have to make chalk in colors that would compliment your hair color.