What a coincidence, I\'m looking for the exact same thing. Unfortunately, I haven\'t found any turorials for cracked desert so I\'m doing trial and error. What I\'m going to try is a thin layer of drywall mud spread over tinfoil (or other flexible, non-flammable material) and then put it under a very hot lamp to dry and (hopefully) crack like normal mud. If this doesn\'t work then i\'ll just lightly roll the tinfoil until it cracks. I\'ll let you know the results. Fingers crossed