I use it to imitate midge pupa. I tie a variation with a glass bead for the thorax. I leave a few Wood duck fibers from the wing pad sticking up at the head of the fly to imitate the antenna of the midge pupa rather than cutting them close. Red beads work well, but so do several other colors.

http://i5.photobucket.com/albums/y166/f ... 1192549599