Chalk isn't just for sidewalk art anymore. Temporarily coloring hair with the stuff is all the rage in the online hair community.
You can chalk your hair, and put it in a braid.
By the way, here's a good tutorial on how to chalk your hair.
Source: 97.74.65.162
Truly masterful hair chalking leads to the appearance of different colors of yarn woven together.
Source: http://24.media.tumblr.com/tumblr_m9g74uQXyz1qbaen3o1_400.jpg
Via: pinterest.com
Source: images.madeinchina.com