The blog cited below has loads of illustrations of the most interesting papers. Here is just one which I particularly liked. It is a nice politically correct "post-Revolutionary" Jacquemart et Bénard paper of 1801 showing a departing soldier and couples dancing round a maypole. In the maypole scene banners inscribed "Liberté" have apparently been erased and replaced by the crowns of foliage!
Wallpaper on Gallica - quick link
"L’âge d’or du papier peint est dans Gallica" , post by "Peccadile" dated 27/01/2014 on Orion en aéroplane ~ Blog culturel