I know there is already a member who spends the time to create calendars each year and raises money for bengal/cat related charities from them. I don't see why greetings cards couldn't be made available as well for the same/similar charitable causes.
All you'd need is a willing volunteer who would be able to organise the collection/production of the greetings cards as well as all the handling of funds. I know the calendars are always very popular and lots of members happily submit their photos for that.
If the willing volunteer(s) thought it was doable you could probably do several themed greetings cards for all sorts of holidays throughout the year. You'll just have to find members with Bengals who don't mind being dressed up as Easter bunnies/cupid/pumpkins/turkeys/christmas trees etc etc etc and who would sit still for more than 2 seconds for a photo or two in said ridiculous costumes.