Zentangles are doodles. If you have not discovered this drawing fad just google them. That said I think they are fun. It is relaxing create patterns and to generate ideas for stitching.
I found this Video which I thought readers would enjoy.
I have become fascinated with these little doodles with intent and the primitive patterns they create. Embroiderers only have to look at ethnic embroidery around the globe to see people of all races embrace pattern and pattern making.
Zentangle is a term coined and marketed by Rick Roberts and Maria Thomas. As you can see the key idea behind it is doodling with the intention of building areas of pattern. If you want to read more about it you can check out their blog called Blog Zentangle
Or this video
I found this resource site which covers how to create a zentangle the regular way with pen and paper. Anyway check them out if you have not done so before and try doing one and then think about how you might stitch it!