Select a square sheet of paper,any size. Make sure the paper is square for the design to work. For a larger box, start with a larger sheet of paper.
Fold the paper in half horizontally and vertically, creasing it both times. Open it up and fold the corners to the center of the paper. Flip the paper over. Fold the bottom of the paper over until it meets the center line. Repeat the process for the top of the paper.
Open the folds and turn the paper back over. Position the paper so that it looks like a diamond, and then open the top and bottom flaps without opening the side flaps.
Fold the right side of the paper over until it meets the center line. Repeat with the left side. Fold all four corners to the center of the square before unfolding them. Open the center flaps. Fold along the new creases, creating the sides of the box. Finish by folding the top corner of the paper into the box, creating the other two sides and the bottom of the box.