Mandala is the Sanskrit word for circle, polygon, community, or connection. Usually circular in nature they are used in Hinduism and Buddhism to represent the world and the universe. While many mandalas are often very elaborate and complex there are several mandalas (while not traditional) that you may know that are relatively simple.
For example there is the pentacle, the symbol for yin-yang. There is also the ankh and the celtic cross. Children are also able to draw their own mandalas. I recommend cutting out circular pieces of paper and giving them the necessary supplies (crayons, paint, markers) and the freedom to paint what they want. Have them think for a moment about a topic and then to draw about that topic. Some of those topics can be;
- Sister or Brother
Now while this is far from a complete list it should be a good start. Another option to introduce children to mandalas is to provide ones that they can color. Below is a list of links that provide several mandalas for children to color.