Pick a tile, (almost) any tile
While they aren't as widely used as shingles, both traditional and "cool colored" tiles can be good choices for cooling a steep-sloped roof. Some traditional tiles have naturally reflective properties, depending on their color and the type of the clay they contain.
Tiles have begun to see a slight increase in popularity thanks in part to newer manufactured tiles containing "cool colored" pigments. Developed through a partnership between the California Energy Commission, national research laboratories, and roofing manufacturers, these tiles are produced in earth toned colors including brown, green, and terra cotta, and many qualify as Energy Star materials for steep-sloped roofs. The cost of these "cool colored" tiles is comparable to the cost of traditional roofing tiles [source: Environmental Protection Agency].