If you like to draw patterns or doodle, you can learn to "Zentangle." As the name implies, it's a Zen-like way of creating images through repetitive patterns and shapes. "ZEN" refers to a set of.
Discover the Art of Zentangle Drawings With Doodle Patterns for iOS & Android image
This is a guide for doing their own zentangle tree. How+to+Draw+Zentangle+Patterns