By Jove, I think I've got it.
"The Art Nouveau style appeared in the early 1880s and was gone by the eve of the First World War. For a brief, brilliant moment, Art Nouveau was a shimmering presence in urban centers throughout Europe and North America. It was the style of the age--seen on public buildings and advertisements, inside private homes and outside street cafés--adorning the life of the city."
It fits perfectly with the period I'm trying to evoke (late 1880's) and with the quintessentially French style I have in mind. Also it's contemporaneous with the gorgeous Jumeau style dolls which will be on display inside the shop.
The cherry on the icing on the cake is that Art Nouveau fonts are really rather lovely and immediately evoke La Belle Epoque at a glance.
So, the hunt is now on for ideas for suitable architectural features which I can incorporate into my boxy-looking little shop.
I feel inspired.........