I was inspired by the London Subway. The idea was to create a small contained environment with as few materials as possible and make lots of variants with just three sets of textures and then have a tint able material using various masks. More variations of environments are coming. Also used two variations of decals. Thanks to John and Sven for help with material editors.
Software's: 3D Studio Max, Photoshop, Quixel Suite,
3 types of materials: Tiles, concrete and the rest of the details on an atlas. 2k textures. Albedo, Metallic, Roughness, Normal map and AO.
Initial inspiration found here.