I have just read about this in a Sunday mag and thought it might interest photographers in the UK. There is a photo competition running along side it. Hope its not been posted before.
Showcasing great British art across the UK, Art Everywhere is the largest exhibition of its kind in the world. From the 12–25 August 2013 some of the nation's greatest art is on display across 22,000 poster sites and billboards up and down the country. Artists, curators, media owners and entrepreneurs joined by a love of art have fuelled this massive charitable celebration, and the general public crowd-funded over £30,000 to help make it happen. http://arteverywhere.org.uk/
Thanks Rob. : )