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I bet this would work . . .
Infuse the OO for entire batch with comfrey. If you use a pretty good percentage, you'll get a darkish green. Divide the batch in 3. Leave one batch plain. Add a small amount of cocoa powder to the second batch to get a slightly brownish green. Add a larger amount of cocoa powder to the third batch. That'll give you a greenish brown. Let all of them get to a thickish trace, then add them in blotches to the mold. Don't do much mixing or you'll blend them rather than have distinct colors.
hmm, you've given me an idea, I'll post more later after I look at my stash and see what I have.