I can find nothing online about these. I don’t know if they are officially sanctioned or the output from a local artist or what. I did have great fun spotting them while walking around Florence though. All were taken at different times of day, hence the street-light colour cast to some of them. A couple are not that great (the bird having a poop for example) being a bit blurred, but I’ve included them for completeness.
Photo Gallery: Road Signs of Florence
UPDATE: I have been informed, in no uncertain terms, that I am an idiot. Apparently I was told ‘1000x who the artist was!’. Clet Abraham it would seem. http://www.pinterest.com/thinkorange/clet-abraham/