looking for script to color noteheads on handbell music

[Stephen Corey]

Hello lilypond gurus,

It looks like I'm going to be starting a handbell choir with a number of 
people of varying skills.  At times in the past I would create an .ly 
file for 1 or 2 people who had difficulty and manually color the 
noteheads for their bells.  Now with all new people, I'd like to see if 
anyone has developed a script or method to color specific noteheads on 
the fly. 

I can see this going two ways: either one score with various ranges in 
different colors, or a sequence of score printouts, with each section 
appropriately colored while the remainder is black.  I'd prefer the 
latter but any help is appreciated.  Since I notate music in \relative 
pitch, any script would have to be aware of the octave/pitch used and not 
simply tied to a letter name.  Frankly, I don't even know if this is 
possible in lilypond, much less where to start.  But this software 
continues to surprise me after almost 5 years of continuous weekly use.

Thanks in advance for any help, tips, or pointers to existing 
documentation.

Stephen Corey
Roseville, California