Dark green + a little flash = a feeding frenzy and a mangled paw (pun intended, Dad).
It was a winning combination for a few brief moments on the Poudre earlier in the summer. Doc was a bit skeptical at first, but when he started hooking up with big fat rainbows on virtually every drift, he became a convert.
Doc's a died-in-the-wool dry fly guy, and he'd much sooner float visible dries along the surface than drag nymphs underwater. I think nymphing kind of bores him. When I convinced him to submerge this bug and watch an indicator, he came around after a monstrous trout started zipping his line out, running full steam upstream in a violent streak. The monster managed to spit the fly, enough to cause both of us to throw our heads back in one of those "doggone it" moments that all fly flingers go through from time to time.
The events shortly thereafter became comical, in retrospect. Doc briefly got his revenge, landing another nice rainbow on the flashback PT, only to immediately have it lodged in his hand by the angry trout.
Hook: Tier's choice. I like them in the 16-20 range
Thread: Dark olive
Thorax/abdomen/tail: Forest green pheasant tail fibers
Wing casing: Scud backing or clear tinsel
Rib: Dark green ultra wire (small)