I like to send them, and I like to get them.
I send them to family, although if it's family we're going to see a lot of over Christmas I get DS to make a card for them rather than buy one.
This year I'm planning to take his photo for him to stick on the front and he can glue himself a cotton wool ball beard onto it.
Most of the family is far away though, so a card is usually the most contact we get over christmas.
And I like to make sure some of the neighbours get a card. We have an older gentleman living next door, he's in his 80's with no immediate family, so he doesn't get many cards. We buy him a present too, and make sure he comes round a couple of times for coffee and mince pies and a chat.
And there's a lady on her own down the street, she's mostly deaf so when we see her the conversation is one-sided, she shouts at us a lot but doesn't really hear much back. She once shouted that she's lonely, she doesn't see much of her son, she can't speak to people on the phone anymore because she can't hear them properly.
We just like to make sure that people who might be a bit lonely know that someone cares.
I always loved cards when I was little, I was especially fond of close up's of holly with berries and snow on it, and images of the three kings. DS seems to be the same, he sorted through my box of cards last year and chose the ones that were "too nice to send away" and wrote them himself to me, DH, himself, both dogs, and various stuffed toys.