I have had the Zentangle Renaissance tiles and Zendalas for quite a while, and am just now getting into a groove using them.
Here are a couple of ideas for adding sepia colored ink and pencil to my tangles, and using white to add highlights. I use Sakura Microns in Brown and Black and Caran d’Ache Supracolor Pencils in White and Mahogany.
With “classic” Zentangle, we add depth by shading with graphite to push areas back behind the unshaded, white areas. These shaded areas seem to be “behind” the picture plane. The shading inside the frame and around the flower push the Huggins background in to the distance, giving the appearance of two layers.
By using midtoned papers, we have another way to depict depth and volume. In addition to shading dark areas to push areas back, we can use white to bring areas forward. The dark areas appear to be behind and the light areas appear to rise above the picture plane.
Adding color also helps “organize” the Zentangle tile, with different tangles being different colors, using the sepia to emphasize a focal point.
Perhaps my favorite way to work with Renaissance Tiles is to use black in for a background tangle, and sepia with a few spots of white highlights (“pearl earrings”) to set other tangles or focal areas above that dark backdrop of Cubine and a tanglation of Bales.