I saw these stones up for sale and I'm using them as an inspiration for some scraffito enamel work. The metal blanks will be covered with dark brown, then the other colors will be sifted over and before they go into the kiln I'll scratch lines to show the dark brown underneath.
Here are my first color tests, I still need a deep green and that warm orange, but so far so good.
Another challenge to look forward to.
Peace to you