Adam Weismann and Katy Bryce of Cob in Cornwall have written a wonderful book called Using Natural Finishes, which is published by Green Books.
Adam and Katy have massive enthusiasm for their work, and it really comes across through the book. Its design is great, too; I love the line drawings they've used along with the hundreds of bright photographs.
We had the opportunity to contribute: Adam and Katy have featured some of our work in the section that looks at finishes from around the world.
It's a fantastic book. If you're interested in ecological building, or even if you haven't given it much thought before, you'll love this.