By now, it's more than likely that you're familiar with the term "guerrilla gardening"... but if you aren't, it's a great subject to look into. All over the world, people are planting everything from wildflowers to veggies...
Regardless of whether you are an urban, suburban, or rural dweller, there is inevitably a patch of neglected turf in your neighborhood that might need a bit of TLC to green it up...