The standard CD jewel case is almost perfect for its given purpose, and has been since its creation. However, these cases tend to be somewhat fragile, especially the hinge points. Fortunately, you can make a simple replacement case out of materials common in most homes and offices.
Fold the sheet of card stock in half across its width.
Unfold the sheet and use a ruler to measure two inches in from both sides, at the crease and at the top of the page. Connect the dots from top to bottom, then cut along the lines and across the crease to remove two strips of stock.
Fold the page along the crease again, and then fold over the flaps on either side to create a pocket. Crease the sides, unfold them enough to apply super glue, then press them firmly back into place until the glue sets.
You can use almost any kind of glue that will bond paper. Super glue is recommended because it sets fast and hard, but plain white glue works just as well.
Super glue bonds skin on contact; wear eye protection at all times and avoid direct contact with your skin. Avoid breathing the fumes from whatever glue you use, as they can be poisonous.