This is in our subdivision - I saw it as I drove by and had to sneak a picture. Versa-Lok block with cap, which appears to be the retainer for an elevated patio, judging by the 40 ton or so of screenings I saw in his driveway. (BTW, this pic was taken from about 100 yards away, and cropped down to a fraction of the original - *puffs out chest for having a cool digital camera*

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Notice the turf not removed from the patio area? The block also appears to be sitting on turf (no embedded courses).
This should be interesting to watch over the next couple years....