Little bits of plasticard to make it look like there are blasted tiles about. Heavier sand in the deeper holes.
Who knew that my life would become about making foam look as though it's been blown up by a rocket?
All the world will be your enemy, Prince with a Thousand Enemies, and when ever they catch you, they will kill you. But first they must catch you... Be cunning, full of tricks, and your people will never be destroyed.