Thanks
As to how I did it, it's a bit complicated to put as a list of stages, but watch James Wappel's video on colour theory with greens on YouTube and that explains far better than I could how I for the look I was going for.
I used death worldly forest, ice blue, moot green, bleached bone, iyaanden darksun, mcragge blue, evil sunz scarlet, scorched brown, knarlok green, gauss blaster green, astronomican grey, drakenhoff nightshade, white and black, All in various mixes, to alter the temperature and brightness of the green across the banner.
Did I need so many colours? Probably not since I could mix most from the other colours anyway but I was experimenting so I put on the pallete and used quite a few.