One of the materials I've made for the ambitious Portal 2 mod, Desolation (https://emberspark.games/desolation). This was a PBR remake of the standard wall materials seen throughout Portal 2. We had to recreate these after overhauling the rendering pipeline, and matching the art style, tone, and material definition was important. Flexibility, modularity, and potential for use and modification in future were also considerations.
Created in Substance Designer. Rendered in-game and in Marmoset Toolbag 4.