Came across this pattern by Scott Stisser, that represents a stillborn midge. With a variety of colors it could be an excellent spinner pattern for the mayfly. The foam wingcase and CDC wings would float the pattern nicely and the abdomen and shuck tail would bob in or just beneath the surface film. The link provides the step by step tying stages. 

The Stillborn Midge pattern by Scott Stisser. Here, the foam wingcase is about to be pulled over the wings/thorax area.