Gillibrand has photos of an ex voto at the Basilica of Our Lady of Victories in Paris. It was set up in memory of Fr Ignatius Spencer who had requested prayers at the shrine for the conversion of England. (See For the total conversion of England!)
Incidentally, I have given the link above to the English language part of the basilica's website. There are more articles and photographs in the French section, including this picture by Charles-André van Loo showing St Augustine confounding the Donatist bishops at Carthage.