This fly has been a top producer for me this year and last, especially when they're feeding on crayfish and nymphs in shallow water. Really simple to tie..
Front Hook: TMC 5262, I usually use sz10
Back: Same, or any other hook of the same length, cut the bend off
Tail: Brown Marabou
Body: Medium brown krystal hackle
Eyes/head: black bead chain, tie in so the hook point is up
The connection between the two hooks doesn't have to be super strong since you're not going to hook any fish on the back hook. Any light mono should do.
I also use brown and black woolly buggers, buggy nymphs, and light colored egg patters(sucker spawn, glo bugs, etc.) with success.
lazlo: Huh.. I have three locations where I consistently target carp and the Shenango River is the one I fish the most. I've never gotten one to hit a green weenie there. Weird. I guess I need to fish them more..