So I started out with some pieces of flooring, one of which has had a little cleaning, the others not.
Then I decided to think bigger. I’ve had interesting results with sandstone before, on sandstone coasters. The stone is soft enough that the laser can really eat away at it, at least a little at a time. Of course, I don’t have a good supplier for blank sandstone right now, but I discovered that the original printing can be erased.
Then I did a 3D engrave.
After one pass, I decided to try to emphasize it some. With slowing it down, and multiple passes, it actually started making glass in the darker area.
Then I went for a scale engrave on fully custom settings. Pretty, but a long time.