I took a couple of these ingots and decided to try them out on my CNC mill. It's an EMCO F1-CNC milling machine that was retrofitted by students from Vermont Technical College with new stepper motors, gecko drivers, and Mach 3 software.
After milling some flats on the sides so my vise could grip the ingot, I milled the face and then played with cutting a circular pocket.
Then I played with machining heatsink fins.
I plan to mount some high-power LEDs to this heat sink and make a more permanent lamp for the CNC machine. The current lamp is a single CREE X-Lamp star that Aaron hacked together for me. It does a good job, but I'd like more light.