Changing the color of the cooldown spiral on icons.

[maltese]

I'm looking to change the color of the cooldown/duration spiral on buffs based on the duration remaining. Ideally I'd like to be able get my characters buffed haste rating and define the the time to change the color from the normal black to red based the time between the 2nd to last and last hot tick on a riptide. I can probably figure that part out if I can just find out how to change the color of the spiral based on a set time. Any ideas?