Here is a current project that we are wrapping up in San Rafael. It features a large bluestone patio set in sand. The seams in between the stones will be planted with low creeping Thyme groundcover. Patios set in sand can give a different design look than patios set on concrete. They also allow for future flexibility as the shape of the patio can be fairly easily changed by moving stones. These bluestone pieces are 2″ in thickness and set on a compacted baserock subsurface, providing good stability. Having stones of good size (these are 2′ x2′), thickness, and with proper base preparation is crucial to having a patio that will be stable over the long term.