Fit a piece of plastic foam in a snap-lid plastic container. Then poke holes in the foam with an awl to hold shafted bits, and slice crevices with a utility knife to hold cutoff discs. And/or drill sockets for larger bits and tube-shape containers.
Several folks were interested in my miniature set of Japanese wood carving tools that I use in conjunction with a regular set of linoleum block carving tools for making my own stamps. They are small - about 6 inches long.
I totally have a crush on a guy who's kinda OCD. Im thinking he would really love this. And never let me touch it :) Beautiful hand tool cabinet. There are close up photos of the joints at the link destination.