Here are photos of Nancy's Zentangle tiles: 

 

Introduction to Zentangle Class

Here's a sample of the type of Zentangle tile and patterns that students create in Nancy's Introduction to Zentangle Class. Patterns (clockwise from top left):  bales, hollibaugh, shattuck, crescent moon

 

A Favorite Zentangle

Here's one of my favorite Zentangle tiles!  I started with a floating 'string' then added patterns, confetti dots and shading. Patterns (clockwise from top left): bales, dex, crescent moon, 'nzeppel