Remember your childhood days when you were content to spend hours with a coloring book and a box of crayons? And if you were fortunate enough to have a box with 64 or even more colors?
I noticed during a recent visit to Barnes and Noble that the magazine rack contained many examples of Adult Coloring Books. And I have seen lots of printable coloring pages online.
For example, I added shading. I allowed lines to extend beyond their boundaries. I put colors in places that were unexpected. And then there is that whole cubist thing...