I have been very intrigued for the past year with "green graffiti," but in particular the moss graffiti. This is graffiti done in public places that is environmentally safe and made completely out of moss.
You can find out more about it at the following sites:
- http://www.environmentalgraffiti.com/featured/moss-grass-graffiti/2147
- http://greenupgrader.com/3471/diy-green-graffiti-making-moss-murals/
- http://crosshatchling.co.uk/
