How Cool is this: Moss Graffitti

GreenUpgrader via the Huffington Post.

And from Greengraffi (Netherlands), the benefits of advertising green:

-

sustainable communication media, completely carbon and water neutral

- high impact, long reach, affordable

- long lasting

- targeted communication with your target market in their surroundings

- free publicity opportunities

- positive image for your brand

- full service: from creation through execution