Street art isn't just gang tags — it can revitalize and beautify urban spaces, increase community identity, and even be a form of nonviolent protest. The work of Edina Tokodi kind of does all of those, plus it's about as green as graffiti can be: Tokodi's studio Mosstika makes street art from living moss.

http://www.flickr.com/photos/tedina/2191207226/in/set-72157606038116594

More photos on Tokodi's Flickr stream and the Mosstika webpage.