Collect your materials.

Cut both cereal boxes to create an open-top, with one shorter than the other.

Cover the top of the taller box in your chosen paper using glue. 

Mount the small box on the large one with adhesive tape.

Carefully draw and cut out a rectangular window in the taller box.

Using adhesive tape, cover the rest of the box (except the back) with your primary color paper.

Using a contrasting color, line the interior back of the boxes.

Finally, mount the organizer using some Velcro strips. A quick, cheap, and super effective organization hack done in no time at all!