I have seen and have a couple of products that are "particle" board.
One is called Dakota Burl. It is made with the shells of sunflower
seeds as the fiber. There is also one called 'bio composite' which uses
recycled paper which has been dyed. It comes in several color
combinations. There are also a couple of wheat straw products. They are
manufactured by the Phenix (spelling?) Corp out of Mankato, MN.
Marketed under the name of Environ Bio composits. The resin used is a
soy based product, and doesn't have any formaldehyde in it. They have a
4 or 5 sheet minimum order from the factory, and my price including
shipping was about $5 per square foot to Oregon. Interseting stuff. It
isn't structural, and needs support on about 16 inch centers. The
Dakota Burl is very powdery, especially when turning it, which I think
is due to the softness of the sunfolwer seed shells. The paper stuff
actually cuts better, and when turning, I get shavings, not dust. They
both glue up and finish nicely, but need some filling. They also need
to be edge banded. Because of the glue, there is some blunting of
tools. I have no connection to the company other than a satisfied
customer. I like the idea of their product.