We just redid the living room with new furniture, including new tables. So, I had some nice little chunks of walnut, about 3 1/2" square, so I cut a bunch up square, and 1/2" thick. Then I cut a hollow 3" in diameter to inset some cork in and wallah, some coasters. Cutting the cork was a difficult little chore. I marked a circle on it, then used the bench top disk sander to get them round. They came out pretty good with a bit of patience to fit and sand, fit and sand, etc. I made up a dozen of the coasters.