Joey Roth, based in San Francisco, pointed us to these interesting speakers he designed. The speaker system is made from porcelain, cork, and Baltic birch.
Joey Roth says: "As you can see, I wanted to reduce the speaker system to its most simple form, using raw materials that show their natural beauty and aren't usually associated with electronics."

The included amplifier is made from stainless steel sheet metal, with a cast iron base and paulownia volume slider. Aside from the electronic components, plastic is completely avoided in this speaker system.
You can pre-order one of the first 200 Joey Roth Ceramic Speakers now for $495.
More details on the Joy Roth site.