Put their first pair of shoes in a shadowbox and hang in their room. Use velcro on the backs to make them stay. Note to self: Shodowboxes can be found at Michaels. Something to do with all those adorable shoes! Maybe her first dress?
My kid only naps once a day but it's too precious to be interrupted by UPS, door-to-door sales, etc. I have a handwritten card I post on the window by our front door (from the inside) but this is a lot nicer! Only issue is it requires opening the door to place it outside... might consider placing a suction cup on our glass and using a hook to continue placing it inside our house. :)