Thanks for the link. Haven't read it all. Actually just the first eight paragraphs, but have bookmarked it.
I've let my "lawn" go wild and the results are indeed amazing. Now there are at least 15 different plants growing in the front yard, although not so many in the back. I think the back being basically surrounded by the house and 8' fence keeps the volunteer plants out. I don't water or mow. For most of the year mine is the greenest lawn on the block.
Last spring I pointed this out to my neighbor who promptly replied that it was mostly weeds. I told her a weed is an unwanted plant.
Dallas has a very liberal code and as long as the plants growing are naturally occurring anything goes.