After a long search I finally found a brick wall reference that was different and strange enough that I could make it for my portfolio. This is an old brick wall where I live, repaired with a process that is apparently called 'tuckpointing'.
Special thanks to Jim in the DiNusy discord channel for his excellend feedback!
https://www.artstation.com/tenesium
Interestingly this was made almost entirely without the slope blur node, which I often find to be too apparent in similar materials.
Rendered in 2K in Marmoset