This started out as a joke, but I went ahead and created a bunch of unholiday greeting cards. Well, it's really only one design, but there's a big stack of them waiting to be sent to your friends and family. If you're curious, these Darwin Claus greeting cards are for sale at unholidaycards.com.
And since I'm so full of the (un?)holiday spirit, half the profits are going to a charity I've become quite fond of.
It's never too late to send an unholiday card ;-)