I know what you mean, but I'm afraid that would be immensely difficult. Alot of time, when you get a case that has built in face plates for the CDROMS, they have a colored lens over the light hole, so it changes the color of the LED. I dont think I would try to change the one on the CD ROM drive, there would be a great risk of ruining the drive.
As for hard drive LED, did you mean the one on the case? Did you get it working? You said you were doing alot of piss farting (you must have drawn some mud at one point or another
) so does it work correctly?