Here is my latest material, which I made procedurally in Substance 3D Designer. It took around one week to finish, and honestly, it was challenging as I decided to push myself for this once. I have tried to make each part unique so the graph becomes a little complicated at the end. To some extent, The most challenging part for me was generating masks after creating height map for other channels.
Thanks to the Substance Team for the recently updated version. Without the new "Spline" feature, creating something like this would have been much harder.
Please feel free to share with me your feedback.