Unrolling a box yields a big sheet of corrugated cardboard. After hanging it from the picture rail, and leaning the base on top of a shelf, I am able to hang a large amount of weight. Now my tools are in easy reach. They hang from paper-clips, bent into hooks that poke through slits in the cardboard. So far I have yet to find the limit of how much weight one can put on them before they break. This was never meant to be permanent, but I'm liking it so far!

PS, I ran out of paper-clips, so a few tools are missing and there are two on one hook (the horror). It's usually better :)