The Loop Wing Parachute style fly demonstrated below is a versatile pattern. Try changing the loop wing parachutes body color to a pale yellow for a Pale Morning Dun and rusty brown for a Mahogany Dun in size 16. For Blue Winged Olives use an olive toned dubbing and a size 18 hook and for a March Brown use a tan colored dubbing and a size 12 hook.
Loop-Wing Parachute Adams
Thread: Veevus 12/0 Black
Hook: TMC 100, Size 10-20
Tail: Moose Hair or Grizzly and Brown Hackle Fibers
Body: Gray Dry Fly Dubbing
Wing: White Antron
Hackle: Brown and Grizzly Dry Fly Hackle