The first thing I thought of when I saw this challenge topic is our reef tank. The living corals are just amazing creatures and each has a distinct texture.

In response to some of the questions regarding this image: it was shot through glass of a reef aquarium. And it's not really that small, probably over 2 inches from one tip of a feather across to the other. I appreciate the comments, as it was hard to get the detail of this with the low light and constantly moving water :) thanks everyone.