Rocks and succulents

What does one do with a collection of boulders and rocks that have accumulated over the decades? Well, my friend has found a solution by making a rock wall and teaming them up with succulents. However, rather than directly planting into the crevices, the succulents are in their pots and rested on top of the rocks. Pictured are all things rock hard – concrete floor, rock wall, pavers, slates, a brick, terracotta pots and hardy plants.