I ordered some of the January cards as postcards through Moo.com
(they are pricey, but have such lovely paper!). The back (lower photo) has a simple border with some of the curly leaves.
I may put some of the designs from the calendar up on Redbubble - any preferences?
Also, if you're Duck ($3) level or above and would like to order some cards from Moo, let me know and I can get your desired images to you in their template.
And if you haven't ordered from Moo before and decide to, let me know as I might be able to pass on a referral discount.