Im very sure that Munch will be the same color he is on the logo at the top of this page.
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..I managed to take out the tiger with a can of mace; but the shop owner and his son, that's a different story all together...I had to beat them to death with their own shoes...
Well, you may just be right. But, I think that the computer sort of distorts the color. Also, I've seen some official pics where I swear he was Jade Green...
Perhaps the 'jade green' colour was a result of wet skin, although I'm not sure if, like fabrics, amphibeon skin darkens when wet. Also, Gabbits might have the ability to change skin colour like the Mudokons can.
I think Munchie will be the color he is in the game shots and at the top of the forums page. But I've also seen those pics where he's jade green. Kinda freaky if you ask me! (Which I know one was!)