Not quite as time consuming as writing in stone, but equally indelible: etch your own art in precious brass! The concept is pretty neat: circuit board etching acid eats away at copper and copper alloys. This means that it will eat away at brass, but it's mojo (technical term) is interrupted by the presence of iron. By adhering iron to a plate of brass by way of the iron oxide found in printer ink, we can etch any 2D pattern into our plate.
Step 1: Preparing the Plate
Start by meticulously cleaning your brass plate. Any size plate will do, and the acid bit to the tune of .003"/10min so you needn't worry about the thickness much. I cleaned mine with a Scotch Brite pad, and then wiped it off with acetone until my rag stopped pulling off dirt.