Fill your shadow box with vintage memorabilia. Create a custom shadow box with wood trim, glass and a backer board. Have your materials cut to size at your local home improvement store, and then you only have to assemble the parts to create any.
I created this shadow box using my mother's collection of brooches. It was placed on display at her memorial service. It was heart-warming to see her old friends point to a particular pin and remember her wearing it, or better yet, they remembered giving it to her.
I bit 'busy' looking, but not a bad option for displaying a lot of printed material within a small space; I might have used a bigger box and done something a little more spread out to give each piece its own visual area of interest.