Petrified wood tiles - Very handsome tiles. But you are misinforming your readers when you say it isn't stone and is "warm", so here's a little FYI.
Petrify comes from the Greek word for stone. "Petrified wood literally means wood turned into stone. After the wood becomes buried, [perhaps in water], dissolved minerals enters into the wood and deposits minerals inside the tree’s cells, taking on the exact shape of the cell. Over time, all of the cells become filled with minerals while the organic matter decomposes." What is left is stone which looks exactly like the wood it replaced. The color is determined by which minerals were taken up by the wood.
Wood which is now petrified has to be at least 65 million years old. »
I was surprised when I came across wood tiles, and then I immediately thought of using them for my next bathroom makeover. Not only do they add a cozy cottage-country feel, but they are also a lot warmer than regular tiles.