It’s not exactly new, although I’m guessing many Belgians haven’t heard of it. Eco graffiti basically means street art made with natural products. This implies that the work is impermanent which completely reopens the debate whether (this kind of) graffiti should be illegal or not. In any case, it is extremely beautiful and innovative.
The queen of green graffiti must be Anna Garforth. This London-based artist makes it a goal to make her works using only the material found on the very location of the work. Especially her typography in moss is really stunning. The moss attaches itself to the wall and can thus stay on location for quite a while.