Bear's CDC Ephron is a great pattern from Bear Andrews that features a CDC wing. Ephrons, also known as white flies are very important throughout the east and midwest in late summer. Trout, bass, even carp and catfish love to feast on this heavy hatch so it is always a good one to have.
Bear's CDC Ephron is tied on a size 12 hook. We also use these occaisionally as Light Cahills as well as general attractor flies.