Did you ever take a bunch of dominoes, some superglue, a square piece of mat board, and put them all together?
Well, you should try it sometime. It's a little project that is quick, easy, and results in something useful! The size container you make depends on how big your dominoes are and how many you use. When I made these, I just went with what "looked right" to me. Then I cut a square piece of mat board to fit the finished container. I think I used a gel type superglue - it gives extra time for moving stuff around to try to line it up (not that mine is perfectly lined up, but I wasn't after perfection, just playing around.)