Mossy Cobblestone Slab is a weathered stone block with moss growing through it. As a slab it is half a block tall, for floors, roof edges, and steps. Mix it into plain stone bricks or cobblestone in small patches so the wall looks aged.
Blocks to try around it, picked by color and surface detail. These are suggestions, not rules.
Ranked by the average color of each block's texture. A close color is a starting point for a palette, not a rule.