Mother of pearl.
As I've mentioned countless times before, we're in the process of redoing out backyard. Jacob has it in his head that once it's finished he wants to have chickens. I have agreed to this on the condition that he builds me a chicken coop worthy of Martha Stewart, complete with white trim and flower boxes. However, I would definitely be willing to settle for this AMAZING design from furniture designer Matthew Hayward. It can fit up to four chickens and is made out of cedar. How cool is this thing?