Joe Reddington wrote an interesting post about leaving notes for yourself to better appreciate various aspects of your life. He uses a google calendar email so he gets emails from himself at unexpected times. I have a page in one of my notebooks which I call "Notes to My Future Self."
My list is more practical: "F.S., you do not like the chai at Espresso Royale, you like their croissants." "Important! Do not apply bug spray within 8 hours of shaving legs!" I like the idea of expanding it for more kindness and appreciation, although it becomes less of a record and rather a series of moments rippling forward or backward along the time-stream of life.