Like Yankee, I used to come up with one design and make all of my Christmas cards the same. Used to send close to 100 cards, now I'm at around 80 I think. By the time I finished 100 of the same card I was pretty grumpy! Not very Christmas-like to be swearing at your cards, haha!
Now I often make 8-10 of each design, especially if I start early in the year. Ideally I would make 8-10 each month. That never happens!
The thing I like about making them all the same, is there is no decision making as to who gets which card when it comes time to mail them! Also, it seems the design process takes me a long time, so if I make multiples, I spend less time designing.
I have been really in a slump this year. Need to get a move on, so if I come up with a design I like, I might just make lots and lots of it.
Good luck with your Christmas card making Jan! Don't do what I do, do what I say (ha!) and start now!