I'm a sucker for vintage ephemera... especially if it's French! I have found the most incredibly stream on Flickr belonging to Agence Eureka. A vast collection of quality labels, vintage children's books, ephemera and so on. These labels first caught my eye, but then I started to pour over the collections (and I shall be for weeks it seems) and turned up some real gems like these book covers.
Aren't they beautiful! Some of the images are creative commons so do take some time out to pay a visit.