Stones

There are many uses for garden stones and rocks, besides pathways/driveways, as concrete component (Cracker Dust Blue Metal or Road Base), you can consider rocks and stones as a non-organic mulch. They do not decompose and are very decorative like Blue Metal, recycled Brick, Pea Gravel or other rocks.
It helps to keep the soil cooler by shielding it from the sun, prevents evaporation and weed growth and it obviously looks good.