I didn't get the locking bricks but if you look in the upper left corner near the gate, I was "testing" some out that I got from Home Depot. That area of the yard is my main concern. I've got that PVC drainage pipe that steadily drips condensation from the AC unit and it leaves the ground very moist and muddy.

I got those bricks for $4/each and initially put that weed stopper wrap stuff, and rocks but it wasn't leveling correctly. So I pulled the rocks out and put dirt back underneath and all the water makes that moist and they are all now uneven.

I was thinking maybe sand would be the best route, so I was going to try that.....but then I thought concreting the entire patio would be nice.