My tangle pattern: Kalancho
I thought I had already posted this. It's the last of my cactus inspired patterns (for now, anyway!). Once again nature shows her obsession with repetition. I've done my example as being fairly true to life, but you can go crazy with this one, adding more swirls and flourishes than Snidely Whiplash's mustache, or forgetting the vines and repeating the bell shapes to create circles and squares (or strings for your zentangles!). Enjoy!