Sigma, you are on the right track. I realize that if you wanted to simply change out the blue leds to red ones, that would not be too difficult. However, to go from red to blue, as stated, that would require an inverter chip as sigma stated. This would be quite a bit more difficult. I have a powermate in my hand now smile , so I do know what colors they change from and to.
"Fix it 'til it Breaks."

Jacob - EiC & Director of Technology
Mac Pro Quad 2.66 - 4GB RAM
160 GB SATA RAID 1 - 650 GB Storage
Quad 19" Widescreen LCDs
Accessorized to the Hilt