Simple tie and a little something to aid you in seeing the fly given the right conditions. Fish seem to like dark brown and black flies but swinging a fly to the target when you can't see the fly can lead to problems.
Hook; AJ Steelhead Iron #3
Body: Rear is Black floss Front is built up with black sparkle dubbing
Throat: A piece of Orvis Poly Flash Tubing unraveled
Wing / Veil: Small bunch of black Crystal Flash
Hackle: Black goose
Topping: Light chartreuse green Monga Ringtail or similar soft dyed fur
Note: I make these with orange and white tops also. Depending on the weather conditions / visibility all work fine on the rainbows. Or, just tie on a Thor............