I made a rollup to store all my alligator leads.
It’s simply a series of slits in a castoff piece of leather (sound familiar?), sized to be about half the length of the leads. The slits are staggered so that the thickness of the alligator clips doesn’t stack up in one place. The shorter leads are on the same roll, but I shortened the leather.
Rolled up, it saves a lot of space and keeps the wires from tangling.