Being an adult doesn't mean you should abandon all the whimsical activities of your childhood. Coloring may take time, but it's still meditative and ultimately creative. Who says you have to use the same Disney coloring books from back in the day, though? Answer: no one. The Outside the Lines coloring book has illustrations from artists like Keith Haring, AIKO, Shepard Fairey, Exene Cervenka, Keita Takahashi, Jen Corace, and Ryan McGinness. Buy it on Amazon or at least add it to your Christmas wishlist (which you should be thinking about already).