Mushrooms grown on local, agricultural waste as a substrate, form products ranging from packaging to table-tops and insulations that bio-degrade.
New Yorker article describing the founding of the company, along with the teacher (Burt Swersey), class (Inventor’s Studio), and school (Rensselaer Poytechnic Institute) that supported the founders and idea.
Another company (Mycoworks) is using sawdust as a substrate to grow leather from mushrooms. See this article, for example.