They gave me more lawnbricks! Yay! Free bricks!
Anyway, the neighbor's given me permission to encroach on his lawn a bit, so I'm thinking a ring of the red-brown bricks, pretty large, with three crockery bowls on the inside, holding cactus and things that don't die easily. The bed itself would be filled with short agave cactuses, maybe with a few algarita bushes toward the back. Overall water need--about one gallon a year. Heh.