My default paint scheme for my Dwarven Forge dungeon tiles

1. Prime black. I used Liquitex Black Gesso. Warning some spray primers can damage Dwarven Forge Plastics. See the DW website for details
2. Apply a heavy dry brush of Americana Graphite(a dark grey)
3. Next is a dry brush of Americana Neutral Grey.(a medium grey)
4. Now pick out a few stones on each face and paint them Americana Charcoal Grey.(a dark brown grey)
5. Dry brush Americana Slate Grey very lightly. (a light grey)
6. Almost done, take the Slate Grey and mix in white paint. Use that and do a light dry brush on the edges of the pieces.
7. Now do that to all your unpainted Dwarven Forge dungeon pieces.