CARVED Real Wood Cases for S8 ($60)
CARVED sells a few different choices of regular wood, each with unique finishing touches. They even offer some cases covered in seashells. The Satellite series is the most popular though. It's made out of TPU for drop protection, then they add real wood to the back. Combined with the wood is a hard resin plastic inlay for a two-tone finish that's very attractive.
It's a bit expensive, but worth it as you'll have a 1-of-a-kind case. Each satellite model on the website is the only one. So once someone buys it, that exact case is never offered again. Click the link below and select Galaxy S8 from the drop-down menu. In closing, these are hand-made in Indiana, with wood from the backyard of the company.