I received this card some time ago in the World Languages RR, written in Ukrainian :) It's always a great pleasure to receive a card written in Polish or Ukrainian from people that live in some other countries. I doubt if any Slavic language might become an international one, because their grammar is just too complicated, but still it's so nice to see people trying to learn them :)
This card shows children from Lorraine region in traditional costumes.
Lorraine is one of the regions (another one is Alsace) that used to be a contested territory between Germany and France. I haven't been to Lorraine, but I've spent several days in Alsace and I've noticed a huge influence of German culture there. Even the names of streets in Strasbourg have double names: in French and some dialect of German. So I guess that the culture of Lorraine may also be some mix of French and German influences :)