Greetings,
You are talking to fly fisher who has tying and fishing flymphs since 1972. These flies are amazing, and if you not using them, you are missing fish you should be catching. I use wingless wet flies almost exclusively since they are very versatile.
The term flymph was first used by Vern"Pete" Hidy, a friend a student of James Leisenring, wet fly master and bachelor of the Brodhead. It signifies a hatching or emerging insect. Hidy was very specific regarding it's make-up and construction. The body was constructed so that the silk used to create the dubbing brush showed through the fur or wool, especially, but not limited to the tail-end of the body. The hackle used was soft- to medium soft. The goal was to create a fly that appeared ALIVE!
Flymphs are often tied on light wire hooks and fished upstream very much like a dry fly, and on heavier hooks can be used to simulate insects which are emerging when fished correctly.
There are many great patterns, some which imitate well-known fly hatches. Do an online search, and I'm sure you will find my site which lists many. To throw you a bone, here's a few:
Double Olive Flymph
Hook: Mustad 3399A
Thread: Pale olive Gossamer
Hackle: Medium creamy dun hen
Body: Dark Olive Hare's Mask dubbed Leisenring style on the pale olive Gossamer. Leave a little thread showing at the tail end.
Ginger Spider
Hook: Daiichi 1530 #12
Thread: Orange Uni 8/0
Hackle: Medium Ginger Hen
Rib: Fine copper wire
Body: Ginger colored Hare's Mask, dubbed Leisenring fashion onto orange 8/0 Uni-Thread.
Native American Flymph
Hook: Daiichi 1550 #12 or similar
Thread: 8/0 Uni Thread-Orange
Hackle: Ruffed Grouse-Lesser Coveret
Ribbing: Fine copper wire
Body: American Pine Squirrel dubbed using the Leisenring method on Orange Uni Thread
If you have questions, feel free to ask.
Mark