A few examples from the many materials that were a part of the concrete pavers project I worked on for Poliigon. In this project I was tasked with developing a workflow for converting a non-tiling photo-scanned concrete paver material into a large array of different tiling PBR materials in a range of different colours, shapes and layouts.
The process involved:
• A whole bunch of nodes for creating the different paver shapes and layouts, along with positions and rotations and any other data necessary for processing the base material and controlling individual colours.
• A node that can convert a photo-scanned material into a seamless, tiling base material by providing a manually created mask of rectangles that represent usable texture information so that the node can remove joint lines and any other unwanted details.
• A node that can take a colour input and a second flat colour map input and remap the original's colour values to the new colours while preserving the fine details and natural colour variations.
• A node that can take the data from the layout nodes and the seamless base material and scatter it randomly onto the paver shapes.

Special mentions to Mason Menzies who was responsible for the source photo-scanned material (grey hexagon pavers), and to Christoph Redl who patiently reviewed all 57 materials.

https://www.poliigon.com/search/concrete%20pavers
https://www.artstation.com/masonmenzies3
https://www.artstation.com/christophredl