This is from "Flies for Steelhead" by Dick Stewart and Farrow Allen. pg 44

Krystal Bullet:
Basically tie a sparse krystal flash tail, chennile body and for the bullet...
tie in krystal flash 1/4 back from eye pointing forward, fold back towards rear of hook (making a small, bulbous head...the bullet part) and wrap again 1/4 back from eye of hook.

mix and match colors all you want..