I've made a few shadow boxes. Specifically ones for babys, but they are really fun and easy to make.
Sections
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How to Create a Shadow Box
Main items needed for a Shadow Box
How to Create a Shadow Box
How to make a shadow box
How to Make a Shadow Box
What is a shadow box?
What is a Shadow Box Frame?
Main items needed for a Shadow Box
Shadow boxes and display cases
Shadow Boxes & Display Cases
I've used these to tack clothing discretely in the box
Loops & Threads™ Dressmaker Pins
I put this on the back for the pins to go into
9" x 12" Thick Foam Sheet by Creatology™
Double sided tape for a clean look
Elizabeth Craft Clear Double-Sided Adhesive Tape-.25"X27yd
If you desire a themed background, look up you theme here and use scrapbook backgrounds. They are durable and come in many themes to suit your needs. You can use the foam sheet to adhere the scrapbook paper to.