There are some large mansions starting to pop up here and there, and they have huge lawns, even some of the smaller houses seem to have lawns that are unreasonably large.
I have thought about trying to get people around my area to get into wild foods, stuff already growing out there without human intervention, but haven't really gotten around to it. (many of the people here are either really old or young so I would have a good audience, you also don't want to be talking or handing out flyers to people at the mall or local Walmart - camping grounds, a park, or maybe a farm would be a better place to do it.) Over time this may get them into thinking about having smaller lawns (But then again, many people will be hesitant or outright refuse to eat "weeds". They're going to need encouragement and lots of facts, this is modern society that we're talking about here).
I hope that I'm getting your brain going here. Edible groundcovers/ornamentals might be another thing to consider for those out there that have flower gardens but don't grow vegetables.