The simplest dry fly in the world:

Take a dry fly saddle hackle and tie it in at the bend of the hook. Wrap it forward in close turns until you are near the eye, then tie it off. You can improve the durability by applying a bit of head cement or super glue to the hook shank prior to wrapping the hackle. Look at the grizzly bivisible from the fly of the week archive 2nd quarter of 02. It is just like tying that fly up to step 6. It is a bivisible without the bi, a griffiths gnat without the peacock.

It fishes just as well as any other fly when fish are actively taking caddis. If you toss it right on the nose of a feeding fish, he will sometimes suck it in before looking too closely at it. Skitter it, drag it, bounce it around on the surface, toss it up on the bank and plop it into the water. It gets it's mojo from behaving like something that's alive rather than from looking like something alive and it is truely amazing how many fish can be fooled by such a simple fly.