You know, I never put a letter into greeting cards. I do write short notes. That alone can take up a lot of time. Sometimes I have a photo to put in, but that is time-consuming, too. If I didn't have cousins who mention how much they appreciate getting a photo of our grandchildren, I don't know if I'd keep it up. I'm very proud of the children of course, but you know how it is - everyone always thinks their grandchildren are so wonderful, lol, and others probably aren't really that impressed! It started back when my ddad could be in the photo, too, which was more interesting to everyone.
I'm slipping a little on laundry and need to zero in on that card(s) again.
An addition to the trash-day card is to write the schedule for recycling pick-up, which is every-other-week, so harder to remember.