For Castle blocks
1.) Paint flat black
2.) Drybrush with light gray.
3.) From AK Interactive take the "Streaking Grime Solution DAK Vehicles" add a little bit of thinner and then use as a wash all over the blocks.
For mold, moss effect around base of rocks, blocks and doors use "Slimy Grime Dark" from AK Interactive.
For between the floor stones use MIG Rubbel Dust P234
Metal and wood on door.
