How about a mini accordion book? You can make it as Mini as you like. I found two tutorials on the internet. The first is nice and simple, just use some left over papers and have fun. The second one is more decorated.
You can fill them with a lot of things like ....
- photo's (how about every years school picure)
- birthday wishes
- little drawings
You can find the tutorial here:
Tortagialla the blog
And this tutorial is over here:
Have Fun !