I know this trend is really old now, but I had these sitting around and never got around or really even wanted to try it. I only had a few shades, so I chose the pink one. I only wanted a couple of streaks so I could see how it would turn out.
This is the chalk:
This is how it turned out:
I think I did it right, so I got a good amount of colour, but the bad part is how insanely dry and scratchy it makes my hair. I think it's really cool, for Mardi Gras or St. Pat's or something, though!