[tablatures] Changing note head colors by length

[Viktor Mastoridis <viktor@xxxxxxxxxxxxxxxx>]

Hello,

I know that this isn't strictly tabs, but I need help for educational purposes and I thought I'd start here, my only active /Ly list.

I know I can change colors by pitch here:
http://lilypond.org/doc/v2.12/input/lsr/lilypond-snippets/Pitches#Coloring-notes-depending-on-their-pitch

But is it possible to change colors by length in the same way as the above example?
That would be great for my primary school level kids who struggle...

Viktor