Warning: Lots of images ahead!
If you are an active tangler, you probably know about ZenButtons. I’ve posted a few that I’ve done recently. But do you know about SpundalaZ? These are another type of Zentangle button, but they are created over a base design. This post is about how that base design can be created.
The basic premise is that you need to be able to rotate the tile around the center point, and while it is rotatating, create greyscale or color concentric areas on the tile.