If it's OK,. I'll do one of Davie McPhail's Spent Gnats.
Davie McPhail's Spent Gnat
Hook: # 10 Dry Fly
Thread: 8/0 Unithread White on extended body, and black on thorax
Tail: Black Bucktail
Body: White 2mm foam, with black accent on top with Prismacolor Marker.
Hackles: Rear-Badger Neck Hackle Front: Black Neck Hackle
I tested this out this afternoon on the Hiawassee River. I don't know about trout (I was on the upper non-trout section), but the bluegills murdered this thing. I nailed 25 in less than an hour (and just got through eating them,...mmmmmh). And the fly is still plenty fishable. These are nice and tough.