Over the years, before the era of e-mails and social media, there were traditional postcards sent to us by family members and friends. From my personal collection, here is a sample from the seventies and eighties from Czechoslovakia and Hungary, and from the nineties from Slovakia.
Today, my parents would have celebrated their 60th anniversary. Today, my mother would have been 79 years old. I miss both of them.
There is no need to buy Christmas cards in a store. With a little creativity, one can make their own unique ones which probably would be treasured by the recipients.