Making a couple warpstone counters for a scenario like Warpstone Raid will take little to no time and it'll enhance the game immensely. Plus, if you are a Skaven player, you can use the counters during a game to clearly keep track of how much warpstone your Skaven wizards have left to consume!

	Find a 20mm small square base with no slot in it. Then go outside and find a few small pebbles to represent your warpstone.
	Using superglue affix all the pebbles to the small square base and let it dry. While you are waiting, you could be making a few more warpstone counters!
	Once the glue has dried, base the counter with Chaos Black. Using an old brush, heavily drybrush the rocks with Snot Green. Once the paint dries, drybrush the whole thing again with Scorpion or Bilious Green. Paint the edges of the base Scorched brown and you are done!