kickstarter:

TRASH is a simple experiment: Replace thousands of black trash bags with artist-designed, biodegradable bags and set them loose in a metropolis.

An urban beautification project with a subtle environmental impact, TRASH is designed to encourage participation — whether its intentional, accidental or just a daily chore.

The first iteration of the project took place in 2008. Now the collaborative creators are turning to Kickstarter to generate support for a massive new installation in 2013.