After I asked a frined of mine to host these two pictures, here it is:
A simple to make box draft for printable cardboard.
You will need two A4 printable cardboards. In the first you print one side, and on the other the second.
Note that the sides coloured as pink and green are going to be glued together, so you shall print the image only in the side that has a black "tail" underneath it (bacause the side with the black tail is supposed to be on top of the other side, that way your construction will be more stable).
The white lines are the points where the cardboard gets folded, so they must have twice the width of your cardboard's thickness. The little red lines are to be cut off.
So, L= the length of your DVD case, Th= the sum of your cases thickness, and l-H is less or equal to your case's height.
Was that good enough or did you need a more sophisticated one?