Here’s my first attempt at a Zentangle. Don’t know if I followed the rules, don’t know if there are any rules, actually. May need to click on that link myself.
You should try making your own. I think I made about a hundred in the margins of my high school and college notebooks. They were just doodles back then.
When you try yours, use a marker type of pen. Ball-point got annoying, VERY quickly. Enjoy!