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You'll first need a deep or wide edged wooden picture frame. You can get these from the dollar or thrift stores for next-to-nothing. Your other supplies will be Balsa wood, a ruler, double-sided tape, a pencil, paint or something to mark the wood with, a craft knife, craft glue, and backing paper. Backing paper can just be your standard drawing paper. The contents will determine the size and shape of the shadow box you end up putting together. You can put whatever you want in there as long as it fits! Many people use seaside objects such as shells, coral, pebbles. Some people make entire doll house/storefront/miniature scenes within shadow boxes. Others prefer nature objects: gumnuts, leaves, herbs, flowers, seeds, pods, etc. Take a look at other potential options below. Collectibles: Stamps, spoons, coins, stickers, etc. Scrapbooking: The shadow box provides an great display case for scrapbook elements of all kinds. Insects: Do you have a butterfly or beetle collection? A shadowbox is perfect for displaying them. Be kind to the wildlife though; a paper or photographic collection can be just as interesting Militaria: Medals, insignia, buckles, awards, badges, etc. Play around with a design in advance. That way you'll know where to glue everything in place. Arrange the actual objects on a sheet of paper about the same size as the inside of the frame, or draw the outline of the object onto blank paper to guide your arrangement later. If it doesn't have deep sides already, it won't work well for the purposes of this box. You can buy a shadowbox frame on the Internet or an arts and crafts store. You can even make your own if you want. It's really just a picture frame.
Gather your supplies. Decide what you'd like to place inside the shadow box first. Consider the typical shadow box contents. Arrange the objects you plan to put in the shadow box around a sheet of paper. Choose a frame that has deep sides.