I had read about dried kombucha or vinegar SCOBYs being used as a leather substitute for shoe-making during economic downtimes. These days, it could be valued as a homemade vegan leather substitute--but I haven't found any reports from someone who has actually tried it. As a small test project, I tried using a piece of the dried out "cellulose leather" to patch a hole in some old crochet-back leather bike gloves. I think it was a success. The "celluleather" is surprisingly strong. It is smooth, flexible, and full of character.
The "kombucha leather" is layers of cellulose created by the acetic acid bacteria Acetobacter xylinum. I love that the bacteria does all the hard cellulose-making work for me. The cyborg gloves now contain material from three kingdoms: animal (leather), plant (crocheted cotton backing), and bacteria (kombucha leather patch), as well as petrochemical-based foam padding and polyester-core thread.
Finished product (more photos on flickr):