Well when frost arrives, the boatmen/backswimmer activity starts to heat up! This pattern is a combination of several contributors. I like the brill body material. It has a UV quality that gets the attention of the fish!
Hook: Dry Fly or Nymph sizes 12-18
Tail: Pearl Crystal Flash, one strand
Underbody: Brill, small, olive or silver
Legs: Stretch floss, olive or brown
Bead: Red, 3/32nds
Overbody: Tan 1 or 2 mm foam