This is a mandala, a symbolic representation of "wholeness" that can be used in meditation and other spiritual endeavors. Having spent time this weekend coloring one, I've got to agree with those who say that it's a relaxing activity that helps you feel centered.
According to The Mandala Project:
The word "mandala" is from the classical Indian language of Sanskrit. Loosely translated to mean "circle," a mandala is far more than a simple shape. It represents wholeness, and can be seen as a model for the organizational structure of life itself--a cosmic diagram that reminds us of our relation to the infinite, the world that extends both beyond and within our bodies and minds.
Want some artsy-crafty-feel-better time? Download a mandala and color away.