I tie mine with three strands of herl, two bronze and one natural, twisted together and a dark furnace hackle.Deadly pattern on the wilder waters. I'll upload some pics when I figure out the process.
If you want to try yet another version, use a small butt of thin & stretched polythene, with black dyed peacock body (over lead wire, if you wish) ribbed with fine green wire & a natural black hackle that has only a turn or so.