I got this idea a few weeks ago that just popped into my head.
My children are forever drawing all over everything and they are very fond of passing notes to each other in school.
We are all having great fun with this now, and I can only imagine what a treasure it will be years from now. A collective illustrated peek at who we all are at this point in time and what sorts of interesting things sprinkle our days.
Grab a sketchbook and a pen and leave it sitting around invitingly, and see what you get.
As someone wrote on the first page of ours, Dude, this could be an epic book.