There's a simpler way for this. You model your object the usual way and then you just put it under the Voronoi Fracture. If you use the Matrix Object in Grid mode as a Point Generator you get brick-like pieces. Then, using Effectors, Deformers or Capsules you can bevel the edges or distort the surface or whatever of each brick. If you need a custom brick, in the Cloner, go to Grid Mode -> Form -> Object. But it wont give you the LOTR results, it's used mostly for "voxelized" stylization.