Pretty much all I did was change the colour of the 5th fret from purple to orange, and made it possible to have white parts on the 3d models for the notes. The screenshot below is of it in action with noob edition and RF-mod.

I'm not a programmer (or whatever they call themselves) and I don't know the tiniest bit about python. I made this mostly by following Rogue-F's guide and reading the diff logs that came with RF-Mod.
Download it here
The file contains 2 different versions of the same mod, one for those who are using RF-mod and one for those with an unmodified library.zip. There is an installation guide in there as well.
Feedback would be appreciated, and if anyone has any problems with it then just post here and I'll see if i can help.
Cheers, Glenn.