I've been using turkey biots for bodies the past several years. They tie fast, float well, and last a long time. I particularly like them to tie Gray Drakes, which are a major hatch on my home river. You use a black biot and more or less rib it with a gray one (of course, visa versa works too). Very nice looking body.
You can also use multiple colors and twist them before you wind them on, you can get some very interesting effects with very little effort.