An empty egg carton can be useful when storing very small ornaments. They don’t necessarily have to be round to be stored inside one of these cartons, but it is a good idea to make sure they fit inside the small cups. Miniature trees often have ornaments that are just the right size for doing this, and an added bonus is that more than one of these decorations can be placed inside one of the sections.
If the ornaments are too big for an egg carton, an oversized piece of Styrofoam will also work. In this instance, a small section could be carved out of the Styrofoam with a box knife to make custom storage for different sized ornaments. Discarded Styrofoam is often easy to find right after Christmas because many people throw it out along with their boxes and wrapping paper.
One way to keep ornaments protected when storing them in a cardboard box is to wrap linens around them as cushioning. Stockings, tree skirts, and holiday towels are all ideal for protecting delicate tree decorations. Doing this can also keep them from getting dusty, so they can go straight from the box to the tree during the next Christmas season.