It's not an RGB LED and It's completely possible. The colour of the LED is determined by the signal that the GPU sends to the LED display. It has Red, Blue and Orange signal wires. You can literally take the case off and rewire the plug that is attached to the LED display. I've already done it, thanks to the advice of another user.
There are 5 pins in total.
1. Power
2. Earth
3. Blue Illumination power signal
4. Orange illumination power signal.
5. Red illumination power signal.
When the GPU is underload, it sends a signal to the LED display to show the corresponding colour. I just removed pins 3, 4 and 5 and insulated them with tape, then took the pin out for the plug from pin 1 and placed it in the slot for pin 5. Now it is constantly red whenever the GPU has power. This is safe and 100% reversible. I already tested the voltages at all pins with power and they are the same rating...
this post will most likely be deleted because it could be interpreted as encouraging people to alter their hardware, but that isn't the case.
Here are the photos to verify my story and it is 100% safe. I'm an electrician and would not have done this had i not tested the voltages ranges of each pin.
Here are some photos to show you the process.
http://i.imgur.com/8m27die.jpghttp://i.imgur.com/SkSrHk1.jpghttp://i.imgur.com/jnjDfFH.jpg