I used to have a long narrow wooden planter box - that you’d find in a garden store, so you can lay out the longer cables nicely. But now that I’ve moved house and have a tighter space, I use a metal square plate thing with loads of grooves on each side, from the Ctrl-mod.com - it fits on top of a mic stand.
For cables I do very bright colors by length. Love the tiptop stacksbles but also dig the really short ones too (so satisfying when your module layout plan comes together, but only sometimes).