Inspired by Robs SBS I thought I'd post one rather than just submitting a materials list. This brown drake hackled comparadun is a fairly simple fly but thought some newer tiers might be interested. I tied this one on a size 10 2x hook, though the ones I submitted are on size 12's.
Hook Daiichi #1280 size 10 2x-long dry fly (any 2x dry fly)
Thread: 8/0 dark olive uni (or brown)
Tail: Moose mane
Abdomen: Brown dry fly dubbing
Ribbing: olive gossamer silk (can use floss or 6/0 or 3/0 uni)
Wing: dun comparadun hair
Thorax: brown dry fly dubbing
Hackle: grizzly olive clipped flush on the bottom (sometimes use brown)
Lay down a thread base and tie on sparse moose mane tail and olive silk
Clip a healthy clump of comparadun hair and tie in a length about equal to the hook shank facing forward, about 1/3 - 1/4 behind the eye. I put a bit of hard as nails on the clipped butt ends of the hair and wrap over it to help secure them. As the butts are secured, pack some wraps in front of the hair to help it start to stand up.
Return your thread to between the tail and the silk. Dub the body starting behind the silk and tapering up the abdomen to a bit behind the wing. Counter wrap the silk up the abdomen.
Tie in the hackle behind the wing and dub the thorax, using the dubbing help the wing stand up.
Wrap the hackle, 2 - 3 wraps behind the wing and 2-3 in front. Tie it off and clip the hackle clear of the hook eye.
Whip finish and clip the hackle flush on the bottom to help the fly float low in the water.
Front view of hackled comparadun wing
I drew from a number of patterns and videos, including AK Best's youtube video tying a Green Drake. I used this for brown drake in Michigan last May, though it translates easily for greys and greens, just adjust hook size as needed.
For greys, I used grey dubbing, brown silk, and grizzly hackle.
For greens, yellow deer hair for a very short tail, olive dubbing, yellow silk, and yellow/golden grizzly hackle.