patterns = files(
  'amethyst.pat',
  'brick.pat',
  'cracked.pat',
  'Craters.pat',
  'granite1.pat',
  'ground1.pat',
  'marble1.pat',
  'marble2.pat',
  'marble3.pat',
  'Moonfoot.pat',
  'pink_marble.pat',
  'rock.pat',
  'slate.pat',
  'stone33.pat',
  'terra.pat',
)