well i have noticed something with current cc sprites. it happens where if you have 2 colours right beside eachother ll and zoom out the human brain will blend these to together to make a diffrent colour(excellent way of working around the pallet.) the colours above are a pretty bad example(they generally have to be touching)

look at my sprite of shooks MARS head in the pelian army topic, and lo and behold the green that looks grey!
that trick is key to being a good spriter.