I'm working on a large project and realized much too late that I needed black SATA cables and all I had were the hideous red ones that come with a new motherboard. I had lots of those but no black ones. Being impatient and not wanting to spend more money on something I already had, I decided to change the color.
I just finished this entire case (the Cooler Master HAF Stacker with the additional 915 module, LOTS of case there) with black aerosol Plasti Dip. Turns out it's great for modding SATA cables also. Half of a $6 can and 15 minutes later:
This stuff is amazing. And as modders, remember that it comes in LOTS of colors, they have pearlizer and metalizer for it, clear coat, lots of options.
Two great things about it: With a heat gun a coat of this stuff dries in about 10 seconds, and if you screw it up you can peel it off and start over.