Lobsters! Not only do they have delicious meat, their shells have use too! Researchers at the University of Maine have developed a biodegradable golf ball from lobster shells.
The material of the golf ball is made from crushed lobster shells with a biodegradable binder and coating. Lobster shells are a great resource to tap into as most of the stuff just heads to landfills (no one has a need for red shells, I guess). The balls work with both drivers and irons and flies a "similar distance to other biodegradable balls", though not as far as real balls. Which is okay!