Pavers are actually paving tiles designed for a roof. They're thick -- more than 2 inches (5 centimeters) -- and the cool varieties reflect a minimum of 78 percent of ultraviolet light. And they have all the great features of roofing tiles, to boot.
A roof entirely composed of pavers is as heavy as a stone roof and can weigh more than 23 pounds per square foot. But in a building that's designed to carry that load, the heavy roof can have tremendous insulating benefits. If you don't have a home that can hold that kind of weight, you can install pavers on smaller areas, like balconies.