Drawing character poses!
Parasail-Z Zentangle by Diane Lachance, Certified Zentangle Teacher CZT
I never thought about it being a "zen" thing but I've done this sort of doodling since I was in middle school and come to think of it, I'd do it when I was nervous, upset, or overwhelmed.
zentangle patterns - Cerca con Google
Zentangle ® Zurich Zen & Patterns - Zenjoy Zentangle ® Zurich Switzerland
Open Seed Arts: Koolapopper/Footlites Fun