I just ran across this new product that is really very old - Bark Siding. It is made from bark that is harvested off of trees that are felled for other purposes. The bark is then flattened and kiln-dried and that's it. No preservative treatments or special coatings. You install the siding and leave it alone. See photos below.
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The look is definitely on the rustic side, so it's probably not a great candidate for your urban infill projects. But it does look at home in a wooded setting, which might make it a good choice for your cabin plans.
The product is touted as being long lasting and sustainable, although I am always wary of manufacturer claims. You can check this out at the manufacturers website Bark House Siding
Anybody have any experience with bark siding? Please throw your two cents in.