Think old castles and envision the building blocks of each of these fortresses.  This is an application utilizing gypsum compound to build, like bas relief, blocks establishing the feel of a castle.  These blocks can be textured and pigmented anyway you wish.  Consultations will entail regarding reference pictures, discussing textures, pigments, and size for the area being considered.

The process is to prepare the surface and implement the desired type of block with a layering of compound. Like bas relief, this is a layering process building up the desired thickness of the block.