How do I make camoflage fondant and wut colors do I mix to make the colors

I’m doing a baby shower 2 tier cake it for a lil boy and the want it I’m camoflage my question to u guys is what color icing gel do IOC to get the camo colors also I’ve heard of several different methods of mixing the camo colors do make the pattern which is the best way also I’m putting a pic up and they want a nest with a baby in it on tip of the cake wut would I use to make the nest and how would I make the nest with those materials plz help me wit this