Walker Zanger has a natural stone option that may work. In our Waterfall series, there is a charcoal color that comes in a wallstone. If you visit the online catalog at www.walkerzanger.com, go to the online catalog, then to table of contacts and look for Waterfall, you can see the material shown there. Let me know where you are located and I can direct you to the nearest Walker Zanger showroom or certified dealer.
Thank you.

Thank you for your prompt response. I am still looking for a pattern with a larger width in each layer. I looked through the catalog and didn't see anything quite like that. Please let me know if I am missing it!