When I was going through art school, one medium that always kicked my butt were pastels. I got chalk dust on everything , smeared it smudged it, got it on the side of my hand which always got transferred to my cloths or another part of the drawing. So when I see someone who has great command of chalk as a medium, I get all warm and fuzzy.
Dana Tanamachi is graphic designer that lives and works in Brooklyn New York. Part of what she does is create custom hand lettered signs with chalk, and they are really extraordinary. When I first saw images of her work I thought that she was doing scratch board, then I saw the works with subtle textures, and tonal variations.