A Very Nice Set of Messy Bricks, Part 2 - Substance Designer

Making Some Messy Bricks

From earlier...

The new nodes we added are a Noise Node [BnW Spots 2], a Levels Node, and a Blend node.

Taking the Noise Node and applying it to the forefront of the blend node, connected to the height map node and the normal node applies a rough texture to the bricks.

Below is a close-up of the nodes so far.

Furthermore...

By making use of some noise maps, and having a little bit of overlapping on the tiling squares, there is now a 'mortar' that looks like it is in between, and slightly spilling over onto the bricks.