Each year I take a sampling of the kids work and put it in a folder. (Believe me I have a whole lot more than this.) WIth all the lapbooks we do and our memory albums and each child has an art portfolio too.

But this serves as a sampler of all their work. This way we can see the progression year to year.

I just use an inexpensive folder. I laminated a picture of her with the grade underneath and glued it to the front of the folder. It came out really nice. (And didn't cost much.)