I carry a 4" x 6" sketchbook with me at all times, and complete detailed graphite drawings of the grandchildren from reference photos. I usually draw during sermons (45 minutes) to keep me focused. When I sign them--they take about two to three weeks, I put a Bible reference under my signature from the sermon I finished the drawing.
I also take notes during the sermons, usually two to three pages, and keep the journals.
I write one page "letters" instead of cards. They are surprisingly well-received. I also pen--well, keyboard, an occasional one page update on what I have been up to lately to a small group of family/friends who almost always update me about their lives! It works. I keep a copy of these.
Occasionally, I write small vignettes about my childhood. I wouldn't call it a biography by any means. It will be incomplete and it is meant to be that way.