Here's a pattern that I messed around with the past few seasons and have had some success with, particularly on bigger fish. The freely swinging twin tails seem to drive them nuts.
Hook: Dai-Riki #810 or equivalent, 3/0
Tail guard: Wire loop
Lower tail: Magnum zonker strip
Tail flash: Krystal flash
Upper tail: Magnum zonker strip
Collar: Three layers of marabou
Eyes: Doll eyes
Head: 5 minute epoxy
Chartruese and yellow (pictured here) performed best, with the usual red/white and red/yellow doing well also. This fly needs a heavier rod to cast (marabou and magnum zonker = sponge), but its potential payoff is worth the effort to me.