one of my favorite "display cases" to use during the holidays are vintage ornament boxes-they are perfect for housing a collection of items to create a unifying theme of color or occasion--or both.
i tend toward the old flimsy plain lightweight cardboard ones--they pair up nicely with kraft paper filler.
i find these at the thrift store and usually am scouting out the box, so i donate the ornaments right back at the same time---unless they are vintage Shiny Brite ones, of course.
this little arrangement above will turn into a holiday card or postcard as soon as i decide on a final composition--but admittedly i am having a bit of fun, sorting through treasures hiding in drawers, so this may take awhile.