credits for such beautiful roofs and mine tracks goes to:
Never Roofers: Cave Ruins Tileset (http://nwvault.ign.com/View.php?view=Hakpaks.Detail&id=3515&id=552)
Helvene: Natural Caves Tileset (http://nwvault.ign.com/View.php?view=Hakpaks.Detail&id=6604)
Lord of Worms: Snow texture from Seasonal Forest