Satoshi Fujinuma is a Japanese lathe artist who took part in the International Turning Exchange 2008. In this video he talks about his work and how he finds inspiration from nature for the form, texture and colour of his works.
You can see more of his craft work, art work, exhibition and other works on his website.
Meanwhile, Philip Streeting has published a document full of examples of how design inspiration can be taken from examples in nature. (18Mb pdf)