A selection of effective flies that require some advanced tying skills.  Excellent videos a linked to clearly demonstrate the techniques.

Adams Hackle Stacker
Adams Hackle Stacker
Hackle Stacker A very effective dry fly tying technique perfected by the late Bob Quigley. This fly takes a few tries to perfect the technique, ...
Klinkhammer Emerger
Klinkhammer Emerger
Klinkhammer Emerger The Klinkhammer Emerger is a style of fly tying using a parachute post. The fly sits low in the film and the abdomen ...
Sparkle Dun
Sparkle Dun
Sparkle Dun The Sparkle Dun was originated by Craig Matthews of Blue Ribbon Flies in West Yellowstone. Very simple, inexpensive to tie but boy is ...