Zazzle has Allegory of December and Joyeux Noel cards for both colonial or French court fans
I've written about the wonderful Elizabeth Ocean before and she has released Christmas cards this year! Gingerbread and Candy canes.
I think this card is a bit over-priced but it's too gorgeous to not put up
Victorian and Albert Museum has this lovely winter silhouette scene card
Simple and elegant Damask cards
Colonial Williamsburg folk Christmas cards
CreationsbyTee has affordable and pretty Marie Antoinette Christmas cards
Have you seen any other good ones? If so let me know because I still haven't picked out my cards yet!