Last year I had a post on the custom Leica M9 made from Ruthenium by HRR Manufaktur in Germany. The company now offers several other custom surfaces for Leica M cameras: antique silver, Rhodium (polished or matt) and Ruthenium (polished or matt). The price for the Ruthenium and antique silver surface is 3,500 EUR. The Rhodium surface is cheaper (2,000 EUR) because there is no gold surface underneath:
The new Leica M can also be customized with any of the above options. This spring the company will start selling also soft releases with their exclusive surfaces, priced around 50 EUR. Please note that HRR Manufaktur does not sell the cameras, they just add the custom finish on your own camera (or any other object).