This may sound crazy, and maybe it is, but it works in some situations. Try stripping midge emerger patterns (around 3-6" at a time) such as a
Palomino Midge. I have a friend who fishes the foam in a waterfall pool and takes a number of browns by way of this technique, and he swears by the Palomino Midge. The technique also works in other "normal" situations, though, so you might give it a shot next time you're out.
Also, I have had some level of success with the
Sangre de Cristo Midge fished as a dry fly. These have a lower profile in the water, can work as an emerger pattern, and they're reasonably easy to tie in smaller sizes.
Hope that helps a little bit.
Chris.