I think you will have a much better time if you just use colored tape and/or a sharpie to label your cables at the connector instead of worrying about cable color...especially if you only have 3 colors. I mean really, you can come up with a zillion different color requirements, and then you'll have to remember them all! And what if you turn a mic cable into 5 patch cables next year? Oops, wrong color! And what about all those "special" cables, like your XLR->TRS and XLR->TS and TS->RCA so on and so forth. You can't have a different color for each cable type.
I would go for asthetics...use all one color for your patch cables, with a bands of different colored electrical tape positioned where the connector meets the cable. This will look good and be much more manageable than only having three color choices, or ordering more cable. Plus it allows you to focus on the cable inserts without being distracted by the cable colors themselves. I would use the same technique for your mic cables, etc.
Slackmaster 2000