Copper Plating

This is a paneling block rather than a masonry one, all seams and rivets, so it reads as sheet metal on a roof or a hull. It works best in long flat runs where the pattern can repeat. Broken into small patches it just looks noisy.

Tin Plating is the same block in a paler, cooler tone. If your world has both ores you can treat them as two shades of one material, roofing in one and trimming in the other, which is a cheap way to get depth into an exterior.

Copper roofing is a real building tradition, chosen because the metal lasts for decades and weathers into the green patina you see on old civic buildings.