public art

the first one is an eskinita decorated with tiles from around the world (Lapa district, Rio. also seen in Snoop Dog's "Beautiful" music video)
the second is a bubblegum wall (seattle, wa) anyone can contribute to this disgusting piece of artwork
the third is a strange geometric tower made of glass bottles and other items (watts towers, LA, CA)
The first and the last are the work of single artists that just started expressing themselves