Very few things say "dedicated to your craft" like living graffiti. The time it takes to grow the plants into specific shapes and maintain it can be lengthy, but the results look amazing. Hello/Goodbye by Jennifer Illet is one of those projects that screams creativity, and it uses moss to form the design.
Hello/Goodbye is made up of two female faces: one face is a nicer, friendlier face that has "hello" written in a speech bubble, while the other has a bit more attitude with the words "no." The concept is simple, but the way its been made is impressive. Not only is it extremely large, but it's very well groomed.
Living graffiti is a rarity, but when it is done, you'd be hard-pressed to find anything like it.