This is what I usually do when I'm stressed up or upset or bored or simply when I miss my primary school friends....
My mom keeps a ring file for each of us. In it she'll put each of our personal objects, like birth cert, certificates, photos, and for mine, cards that my friends wrote to me. Was reading the birthday cards that my primaary school friends wrote, and i couldn't control laughing. Now to think of it, our english was really bad then. Here's one example. Joel wrote "I hope you have the most birthday in school". And another wrote " Happy birthday zoe. I like to eat you cake. I (heart shape) to eat.". We didn't know the proper usage of to and from too. Though there are still many cards with content i do not understand, these cards are certainly the best that I've received in my life.
Other than that, there were pics and.... my umbilical cord and ultrasonic scan. The cord was in a red packet though, and I din dare to open it up to see. >_<