It took a couple MANDAL headboards found in an as-is section at the local IKEA to spin Martin's imagination. He figured that they could work with binder clips and boxes found at IKEA as well.
All he needed to do was to fit the metal loops on the clips to the hinges of the boxes, then clip each box to the newly mounted headboards.
This could work great for puzzle pieces as well, or any small toys like Playmobils, etc.
See more: IKEA Hackers
(images: Martin Storbeck)