Art in the City II

Some ideas to change how a city looks could be as simple as using colour or coming up with an interesting idea. JR is a French artist who uses cities to show his work and people to inspire it he says his work is about "Raising Questions", see more of his projects here.
The other image is from a favela in Rio de Janeiro, a favela is Brazilian term for a shanty town. More about the project here.

via Favela Painting Project