If you ever look at celebrity closets, they almost always have their shoes in boxes with a picture (poloroid) on the outside of the box. So you can stack all of the boxes on top of eachother, but will be able to see the shoes from the pic. They take a picture of one shoe facing front and another shoe from the side, so you see exactly what the shoe looks like.

Pretty cool, huh? Try it and see if it works for you!