Hi all,
CDC can be used for a variety of flies, some of which have proved very successful for me. My personal favourite is the very simple 'F' Fly, devised by Marjan Fratnik. The one I tend to use features a sparsely dubbed hares ear body and a few CDC feathers for the wing. The following web page has a picture of the fly and also tells a bit about the inventor:
http://www.ribiska-druzina-tolmin.si/zanim...ulij99_eng.html
I hope this helps.