THX does have a standard for color coding of left surround, right surround, center, and sub, but aside from (most) THX-approved receivers you don't see the standard used much. I have never seen it used on interconnects.

In lieu of nice cable markers like those you linked to, I've used blue painter's masking tape and a black Sharpie to ID a number of longer interconnects in my system.

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review