Print on Demand has it's pluses and minuses. On the down side they tend to be of inferior quality and more expensive on a per-deck basis. On the up side you can do projects that just aren't economically viable in larger print runs and the ability to customize can be powerful.
Playing cards reach Southern Europe sometime around the middle of the 14th Century. By the last quarter of the 14th Century they've reached Northern Europe, specifically Germany, and the Germans go nuts for playing cards. The printing industries there used no less than thirteen different suits, some of them intended for export to other countries. This includes: coins, cups, swords, hearts, acorns, leaves, bells, shields, crowns, flowers (several types), birds/hawks, dogs.
I put together a basic deck with a King, a Queen (which the Germans didn't use), an Over/Knight, and Under/Jack/Knave, and 10 through 1. The German/Swiss decks tend to use a banner/10 and drop the 1. They also pioneered the use of printed card backs (which was very hard to do with the technology of the time).
The beauty here is that because of Print on Demand I can allow customers to build their own deck. They can choose the composition of their court. They can pick four suits from the 8 I currently have. They can pick a solid card back color or one of two designs. The cost is still higher per unit, but the ability to have some say in the design of the deck will hopefully compensate for that.
I'll let you know how it works out for me.