As a base I'd say Kabalite Green for the green highlight with Sybarite Green with coelia greenshade, Khorne red for the red highlighted with Wazadakka red possibly darkened with Agrax Earthhade.
Yellow and Grey are just whatever takes your fancy.
And because pictures say it better this green:
and this red (this has however been edged in orange):
I'm a big fan of airbrushing as a method, for this two colour scheme I'd advise airbrushing the model with the green and doing the red by hand.