It can be anything, really. Within reason, anyway. Everyone's going to be reading this.

[ so if you put a dickbutt in here and arianna sees it so help you church you'd better pick a god and pray ]

You can just write a message or you can make something or draw something... if we had a camera, we could take photos and fill it that way. That kind of thing. It's for memories, mostly. So no matter what happens after all this... it won't just be the bad parts we take away from here. We'll have something we can remember the good with.