Reading through the article, I became so excited to try it when I realized that I had the exact set of pastels they used in my dorm room! I convinced one of my roommates to try it with me and here's how it turned out:
Meghan (left) has a blue streak; I (right) have a purple one.
Unfortunately the chalk gets EVERYWHERE... my entire neck was purple by the end of the night! And it sadly washed out the next morning in the shower, but it was still fun to do just for one night!