If you're referring to the stone paving immediately around the pool (the pool coping) it's called "Crab Orchard" stone from Tennessee. The rest of the paving is colored and stamped concrete.

I meant the walking paths in the picture which are referred to in the description.

The paths behind are of "Mountain Pebbles". They are similar to pea gravel but not so round. Because they are more angular, they mesh together better making them a more stable walking surface. These are all products available in Atlanta and North Georgia into Tennessee. In another region, the products available will be different because of the natural resources there.