Step 1: Collecting the Parts
CD cases - 7 is a nice number (only the front is required)
A small mass - e.g. keyring
A pair of scissors
Step 2: Disassemble CD Cases
Step 3: Threading Together
Measure out and cut a piece of string to about 3 times the total length of the cases; you can always cut it shorter.
Find the midpoint of the string and, starting from the bottom, thread the string through the holes in the side of the case ensuring that the string is diagonal within the case and straight between the cases. (If the string crosses over between the cases they will all flip around when you pick it up).
Step 4: Finishing Off
Once you have threaded the string through all of the CD cases tie the two loose ends together so that the string makes an angle similar to the crossover within the frames.
Finally tie a loop in the end of the string to hang the photo frames at the right height.
Step 5: Framing and Hanging
Carefully lift the string from the top whilst keep the bottom taught so the frames don't slip down.
Then just hang on the wall and enjoy.