Just on a whim I started some doodles, using the same shapes as a jumping off point for each - the circle within 2 circles as shown at the top of the page. Even though I didn't have a specific idea of what to do most of the time, I would just build on the shapes and see what they became. Inevitably, once you eliminate the obvious, you just build and build, but it doesn't really become anything in particular (i.e. the thing at the bottom). Still, it's pages like this that can lead to future projects.