What about a scrapbook? A REAL scrapbook that has the stencils, matte boards etc.
With the scrapbook, they can keep momentos, photos, etc of events that happen up until their senior year. During their senior year, they should have a memory book and they can keep their senior memories there.
If you purchase the books, they could get together periodically to work on their books. I don't know if you will follow them throughout their tenure, but that could be a way that you all get to bond.
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