Short time ago I was thinking of a new shelf design – consisting of individual fingers.
The whole design is very easy to build and you can build it out of materials you can get at every hardware store.
It’s actually just wood, skateboard spacers in either 10mm or 8mm width and a metal bar with 8mm diameter (so the spacers will fit).
Here is a model I did in SketchUp:
There’s actually a lot improvement you can do here – like creating finger’s that stay in place in an angle, different fingers for round stuff, fingers for special tools etc.