Just learned how to draw a Zendala thanks to  www.milliande.com ...Zentangle is the style of design and it's a Mandala because it's drawn inside a circle...this was my first effort and took me about an hour...I followed Milliandes YouTube video for most of it and then added a few designs of my own.
Go onto Milliande's website and watch the video of her studio in her garden...IT'S COOL!!!