When not looking for challenges, I'm working through the book, One Zentangle a Day, by Beckah Krahula. The Day 1 Tile:
Create a Zentangle using Static, Tipple and Crescent Moon.
String: TanglePatterns.com String #5
Tangles: Static, Tipple, Crescent Moon
Materials: Uniball Vision Needle Micro, 4B pencil, Sakura Gelly Roll White pen, recycled 60# sketch paper
My shading needs work, but am happy with the composition.