I know that you just grabbed that $500 Leica pen and am feeling quite luxurious, but considering what’s out there, you are still pretty low on the being excessively extravagant ladder.
Brikk Designs house which is notorious for covering anything in gold (dog harness anyone?), released a gold covered Nikon DF called the LUX Nikon Kit. It is a Nikon DF Camera along with a Nikkor 14-24 F/2.8 lens finished in pure 24k gold. But the gold just did not make the Nikon luxurious enough so sections of the camera are adorned in stingray leather.