Classic SF-inspired festive wishes worthy of any of SF magazine cover, courtesy of sms
This jolly image courtesy of Beri in Slovenia
A cheery Christmas scene from 2000ADs brilliant Rufus Dayglo
Wacky alien good wishes from writer-artist Jon Charles
... and a more traditional but elegantly created greeting from startrek.com and Star Trek Magazine artist David Reddick, one of my favourites.
I've had a few more, but Blogger seems to be acting oddly, so they'll have to keep...