grown-up printable coloring pages, I don't agree with all the meanings some put into attribute to a mandala design. I do find that many mandala designs can be a relaxing form of art either to focus in, or to let the mind temporarily wander.
How to build your own mandala. Look for radial symmetry of 8 or Mandalas can be created on paper, in the earth, or by using repeating found objects such as leaves, twigs and flowers. (Mandalas can be many things, yknoww)