Recently Rick and Maria posted a grid on the Zentangle newsletter - and blog too - that gave out all sorts of ideas for tangleations on a basic grid. I liked this so much I put the grid on the back of my sketchbook so I can refer to it often. They are like little grid seeds that can go together so many ways to create something new each time.
I used a zendala tile and adapted a grid that Margaret Bremner had shown on her blog a while back. Then I started with the seed that's in spot J1 on the grid. By twisting it around and adding a few variations, I was happy with the final result. I used my black IDenti-pen to get the thick black lines and a Tombow marker for the vibrant pink color.