There is a new tangle from Zentangle. It's called Rumpus and it's lots of fun to play with. Rick and Maria have a YouTube video demonstrating it that will get you going.
In my version I used a set of 6 3z tiles. (It's done on a Zendala tile in the video.) I used 3zs so I could do this tangle in a larger scale and play with it by rearranging the 3z tiles. Photos below. I used a sepia colored pen and colored pencils for shading.
I originally did it with just a brown colored pencil for shading. I wanted to play with color though so I added two shades of yellow, two shades of orange and two shades of red colored pencils.
One of the fun things about doing it on 3Z tiles is that you can rearrange them to make different patterns. I had a lot of fun playing with the different results. Check my blog post earlier to see some of the options - click here.