Well, despite camo being "unecessary", I like camo. I think it looks cool and makes me feel all warm and fuzzy inside because it reminds me of the woods, and then of hunting, which of course leads to that warm/fuzzy feeling.
So, to answer your question from my perspective flyfish, I've done a simple tie-dye with Rit and big rubber bands. Gives it a cool "psychedelic" effect in a pattern that I'm sure none of your hunting buddies will have.
I've also used the super big permanent magic markers and drawn limbs on them. Much easier and works just as well...for someone who likes camo that is.
Good luck; I for one would like to see pics when you are done.