I read about Candy Chang in Oprah Magazine (where I learn everything worth knowing... well Oprah magazine and Radio 4). She is an artist and social activist and creates fanastic things which encourage people to engage with public spaces and their communities and have their say. Here are some pictures which are all from her website : candychang.com.
The Before I die... project was constructed in New Orleans and people coudl write what was important to them on a blackboard that was nailed over an abandoned building.
Looking for Love Again was a project in Fairbanks, Alaska which looked at the abandoned Polaris building. People could write their memories of the building on one side of the chalk board and their hopes for the building on the other side.
There is so much inspiring stuff on her website, I love it.