MOTM

>I color-code by length, and use black heat-shrink. The magenta is by far the
>coolest color (used for 3-footers). :)
>
>Paul S.
>

Same here, black heatshrink and the following lengths:

1' black
2' blue
2' magenta
3' green
3' orange
4' red
4' purple
6' yellow

No real pattern to the colour/length, I just picked them at random.

Red and magenta look quite similar, so consider making them vastly 
different lengths to help differentiating them.