Here's a great resource stumbled upon by my still-favorite Paris blogger, Messy Nessy Chic. It's a stash of really cool photos "documenting forgotten ghost signs, shop fronts, vintage typography and general nostalgia of bygone French patrimony." http://www.messynessychic.com/2015/06/04/heres-an-instagram-account-dedicated-to-finding-forgotten-french-ghost-signs/
I particularly like this one, which captures that curious ability that Paris has of completely changing its nature in mid-block, or at a street corner. For example, the corner of rue du 4 Septembre et rue Vivienne:
