Marble painted panels! The black paint seems less well-behaved than the others; all the panels that feature it came out a bit messy, and that's kind of a shame because black is also the most-requested colour. Each of the other colours seems to have slightly different behaviour, too. But overall I think these came out pretty well. More are still in the queue.
This is the device in question, and I sure hope that the guy who will be in tomorrow really knows his stuff because the manual for it is notably bad.