Graffiti is going green. It looks like some Eco-friendly bombers are fed up with the harmful chemicals their Rust-Oleum spray cans are doing to the ecosystem. Alec Holland would be proud of moss graffiti. Gone are the spray paint and markers; they’re now replaced by paint brushes dipped in “moss” paint. It’s like turning your throwups into Chia Pets. For those of you interested in this form of “guerrilla gardening,” wikiHow has instructions on how to go about it.