While we often associate "living walls" with flora they can also be alive with visual art. Ever since landscape designers and plant enthusiasts such as Patrick Blanc, launched this vertical gardens "movement" throughout Europe a few decades ago, we've been offered surfaces teeming with sedums, ferns, moss and so much more.
Concurrently, street art, also known as graffiti art, has also been flourishing in towns and particularly, cities throughout the world. As no surprise, Mexico, famous for its murals back in Diego Rivera's day, is also awash with creative and fanciful outdoor murals. Many have a social justice message too.