He didn't ask that though, he wanted to know the official colour scheme
Starting with the cloth a base of Caliban Green is a definite. For the highlights the closest match to the old Snot Green is Warpstone Glow. With washes you'd be best off with Biel- tan Green.
Do your armour as standard. Personally I go with a base of Ironbreaker, wash of Nuln Oil, then either Ironbreaker again or Runefang Steel.
The helmet-wrap thingy... hm. Camo Green base, equivalent now being Elysian Green and I think either Tallarn Sand or Zandri Dust for the yellowy parts.
The spear shaft, perhaps a base of Steel Legion Drab and work up to Karak Stone? I'm not entirely sure, will have to look up that one tonight, but hopefully this will give you some ideas.