The above image is from http://www.luzinterruptus.com/
It 's a beautification/installation project by Luzinterruptus in Madrid titled Urban Nest, the link was forwarded to me and is initally from the website Dudecraft, just to keep the resources clear http://www.dudecraft.com/2010/08/urban-nests.html

I will likely comment more on this project soon, however for just now here's the image, link and info.