Sometimes Art Therapy is devoid of diagnosis. It can be for pure pleasure or to help focus. The Art Therapy world has embraced Mandalas, either self-made or pre-made in a coloring book, for these purposes. Working on a mandala can have a calming influence.
Below is one that I created with many identical spokes radiating from the center. You decide how many to use and the designs you wish to create. It doesn't have to be this elaborate. It's yours, you decide the whole thing. This one was done with fine tip markers. Enjoy!
Fluffy Poppet made three Mandalas in answer to this post. See them on her blog. But Drinfear mentioned the word Sigil. And when I looked it up, it is a symbol in one case. Her second image is on the order of the samples below. Her third image follows the same style only simpler. These are examples of Sigils.