Here is a nice Brake/Clutch Master Cylinder Drip Tray sent along by Robert Levert in Grand Rapids, Michigan. It is intended to make it out of stainless steel and weld the four corners. Also recommended to put an oil absorbing pad inside to avoid any liquid brake fluid being blown out of the tray while driving.

The original idea comes from the German MG Drivers Club, who used to have these on sale in very small quantities many years ago (but no more).