Off Topic (but not much) there is an artist (based in Florence, Italy, but born in France) that applies stickers to common road signs, often they are really nice.

Cannot find a reference in English, some images are on this wikipedia sandbox:

https://en.wikipedia.org/wiki/User:Marcus1093/sandbox

and on this article (Italian):

http://www.art-vibes.com/street-art/clet-abraham-il-nuovo-vo...