Not to be sounding my own horn but there's a fly I tied for the Coffin fly that works pretty well.It doesn't require a large hook.In fact the idea is to use a small hook with an extended body to give the impression of a large fly: [url=http://shop.flyfishing.about.com/images/1047/coffinfly.jpg:f2e17]http://shop.flyfishing.about.com/images/1047/coffinfly.jpg[/url:f2e17]
Also, the '2 feather fly' can be tied, also using a small hook.It too has an extended body.Suggest white spade hackle for the tails, body and wing.Badger hackle for the hackle collar.
Yet anoother choice is the White Wulff that uses a size 10,2xl shank hook.

Good luck.

Allan