mix and experiment, and you shall find your way.
i myself always end up loving the ink i mix up. i think it's like a father/son bond i build with my mixture. it's my frankenstien's monster, so to speak.
mix up 2 parts yellow ink, one and a half parts green ink, and half a part of dot 3 or 4 brake fluid. put it in a mop with two bolts or marbles or rocks or whatever. there you have a very simple, super loud green apple shade.