I am currently using the OM Preschool Package with dd5, so there is no "work" to store other than her paintings and colorings, which I store in a folder. I am using the Sixth Grade package with dd12, and we store all of her work in binders: one for ancient history and grammar; one for science; one for math. When she makes large art projects, we display those for a while; then I take a picture of it and toss it (unless she wants to keep it in her room.)