The Stayner Ducktail, my all-time favorite warm water fly. As I've stated before, I've used it successfully for trout in stillwater but have never tried it in streams.

Using the mallard feather whole as the wing: http://flyanglersonline.com/features/lakes/part12.php

Or bunch the fibers: https://www.youtube.com/watch?v=HPYOE0GGdSk

Joe