One audio friend recommended a DIY solution: put all cables inside insulation foam pipes used for isolation of copper water pipes. Those are available at any DIY store for dozen a dime.
Not as cool as the dark fields, not as pretty either - but if there is a cable mash behind your rack, this is a way to solve it [emoji3].
PS: At some point I did have an issue with interference and buzzing when power cords and ICs were touching each other. This is how I resolved it.
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