Psh. When I'm stressed, I watch violent movies or go to the range. If I need some futzy stuff to calm me down, I can knit, sew or any number of crafty stuffs. No color books for me.
I did get one for my Mom, and she likes it because of the detailed patterns.
"There is nothing in the world so permanent as a temporary emergency." - Robert A Heinlein The Moon is a Harsh Mistress