There's a book called Walking on Eggshells, where they found actual sauropod skin in Patagonia.

Immediately something like scales fell from his eyes, and he received his sight. He arose and was baptized.

And immediately there fell from his eyes as it had been scales and he received sight forthwith, and arose, and was baptized.

(iv) Kahawa coal. These are pellets made by grinding the wastes from coffee husks and mixing them with clay and water.

When the dew that lay had gone, behold, on the surface of the wilderness was a small round thing, small as the frost on the ground.

And when the dew that lay was gone up, behold, upon the face of the wilderness there lay a small round thing, as small as the hoar frost on the ground.

It actually takes things we would consider waste things like seed husks or woody biomass and can transform them into a chitinous polymer, which you can form into almost any shape.