color notehead according to absolute pitch

[Kenny Stephens]

Our church has a handbell group whose members are not all musically literate. To
keep themselves from having to learn to read music, they mark their notes using
differently colored highlighters. 

Is there a means by which I can color the notes based on its absolute pitch ---
not its pitch class? Some of the music spans three octaves. The requirements 
are:
  1) b4 and b5 are different colors. 
  2) b\flat4 and b4 are different colors.
  3) different pitches can be assigned to the same color (some "ringers" play
two or more handbells).

I've only been playing around with Lilypond for about a week (though I've logged
numerous hours) for typesetting organ music; but this is different. I did find
an example using Scheme and 'staff-position,' but this fails condition 1.

Ideas, suggestions or solutions would be appreciated.

Thanks,
Kenny