I know this is a Catskill fly fishing board, but I think one of the great fly fishing minds of all times was Gary LaFontaine. To say his patterns were slightly different than classical Catskill flies would be an understatement, but the few that I utilize are highly effective under the right conditions. And, mostly I call upon their services on New York City water supply reservoir Catskill tailwaters.
My two favorites are his Air Head - either side in photo below - and a Halo Emerger - middle fly.

Ed