Because I'm useless and forgot to send cards this year, here's my card replacement:

Wishing you all a happy [insert name of celebration here] and a joyous new year (if your new year starts next week, that is. If not, happy new year for whenever it does start).

Merry Christmas to all who celebrate it. And season's greetings to those who don't. :) Hope your festivities (if any) go well.

Hope your festivities are going well, whatever it is you're celebrating. :)

(Could be better for me, but yeah... We'll see how it goes)