Hi,
My buddies and I fish a certain river not far from Yellowstone in early July and have had great luck with flavs. We did really well using a size 16 and size 14 Sparkle Dun. That stream is a pretty fast stream. So, was thinking of something similar which might be an even better floater.
Anyway, the simplest flies tied:
http://i1101.photobucket.com/albums/...h/IMG_2879.jpg
http://i1101.photobucket.com/albums/...h/IMG_2878.jpg
http://i1101.photobucket.com/albums/...h/IMG_2872.jpg
Or a biot bodied one?
http://i1101.photobucket.com/albums/...h/IMG_2873.jpg