“Today, mandalas are entering into medicine as a healing tool. Researchers and many physicians suggest that meditation can help to boost the immune system, reduce stress, combat depression, lower blood pressure and help to promote restful sleep.” ~ From the Xinalani Retreat Blog: http://www.yogaretreatsinmexico.com/2010/12/color-your-way-to-calm.html
You can draw your own mandala(s) or color in designs created by other people for this purpose. They can be as complicated or as simple as you need them to be.
You might also like: Introduction to the Healing Powers of Mandala Coloring Pages