Hand painted texture maps put into Unreal. I hand painted each of these maps in Photoshop. Albedo on the upper left and roughness is the bottom left. The far right is the material structure in Unreal.
Galvanized Metal
Blue Tarp
Bronze
Ceramic
Chrome
Nickle
Copper
Glass
Polished Stone
Grass
Leather
Painted Stone
Rough Concrete
Parkerized Steel
Rust
Satin
Rough Stone
Fresh Snow
Skin
Stainless Steel
Rubber
Styrofoam
Veneer