ROOFS
Let's say you need a quick render of a building with terracotta roof tiles, the free Archimesh plugin comes with 4 default ceramic tile types you see below. You can easily adjust the roof slope, number of tiles on each axis, the tile scale, tile thickness. If you wanted to pre-age the look of the tile or change the colors, material/texture, shininess or roughness or any other parameter, it's very easy to do by just modifying the input nodes and procedurally generate the changes without UV maps or outside images. Below is how they look on a quick render of a simple house (also mostly using the Archimesh plugin).