I like the potential bucktail has as both ribbing, and in this case as a 'quill alternative'.
http://www.danica.com/flytier/hweile...urple_buck.jpg
Purple Buck
Hook: Wet fly, up eye #12 (old-old stock, no identification)
Thread: Benecchi 12/0, black
Hackle: Andalusian Blue hen (or dark dun)
Body: Bucktail, dyed purple
Coating: Varnish, clear
Cheers,
Hans W