This is really easy. Mix a little bit of mica powder (Pearlex, Perfect Pearls, loose pigment or mineral eye shadow!) with a little Pledge with Future Shine floor finish. Paint (or drop) on a sheet of raw clay. Allow to dry. Then run through the pasta machine 2 or three sizes thinner, rotating so it crackles both directions if desired. Then cut shapes/strips, assemble (maybe on a backing sheet of clay) and bake! A coat of Renaissance Wax or Future will protect it.