Since my daughter's first day of preschool, I've been drawing dinosaurs on her napkins that go in her lunchbox. I try not to repeat any species, but sometimes she requests one of her favorites (triceratops and tyrannosaurus rex). It's a little reminder to her in the middle of her day that I love her.
She chooses a classmate to give her napkins to after lunch, so I started taking photos of them about a year ago and posting them on Instagram as a way to archive them for her.
More info: Instagram