Closer to what I would want but still :

\new DrumStaff \with {
} {
    \context DrumVoice = "1" {
    \override NoteHead.color = "red"
  }
  \context DrumVoice = "2" {
    \override NoteHead.color = "green"
  }
  \repeat unfold 2 \grooveI |
  \repeat unfold 4 \grooveII |
}

HTH
-- 
Pierre-Luc Gauthier

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