We bought these weird jelly balls that absorb and retain water so that plants can grow in them. A sort of decorative soil, if you will. The balls start out as tiny grains that look like dried fish eggs, but once you soak them in water for a few hours, they grow to about half an inch in diameter. I thought they looked interesting up close, and actually sort of reminded me of the Macintosh screensaver. But once I started taking photos, I realized there was a lot more detail going on, which I find makes the photo a lot more interesting.
This image makes a great wallpaper. You can download a copy here.