Guerrilla gardens from around the world.
For those who don't know, guerrilla gardening is planting flowers or veggies or herbs in public places such as ugly and abandoned lots or other neglected or unlikly places in an effort to make them useful or more attractive.
One method of guerrilla gardening is to embed seeds in dirt clods and toss the clods, surreptiously, into vacant lots or along road sides. Then a little rain and mother nature takes over.