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.Mandalas are commonly used by tantric Buddhists as an aid to meditation.
In this group, you don't need to worry about sticking 100% to a religious meanings of mandalas. We would like to see shapes that reflect symmetry or, a motif of some kind. Your images can be circles, squares or rectangles. If rectangles, they have to have round or square central point. The rest I leave up to your imagination and preference.