The best I have ever found worked so good it made the people fishing around me mad. It was fun.
All it is is a small wet fly hook, any you feel works. I did mostly 12's. If you need to get a little more depth, you can start off with a little lead wire. Then using red thread, tie in a tail using long fibered marabou where the ends are straight and webless, like fine hair. Use just the tips and go 1.5 times the hook shank. Tie in a piece of chenile and tie it off so there is a distinct red bandbetween the tail and the body after you wrap it forward. I make the band a fat 1/16th inch. (3/32") I tie off the chenille but not make a head at this point. I change to a matching thread, white or black thread and then tie down the red thread and make my head.
These can be fished a few feet below a palsa pinch on float or some other indicator. If you use one a very effective way to fish it is strip the fly at you for a couple of fett. This will pull the fly up in the column. Pause it long enough for the fly to hang directly below the indicator and repeat. They can be fished below a floating fly as well in states that allow that. You can fish them without a float at all. That's the way I generally do it.
The best color combination I ever found was white tail, chartreuese body. But orange tail purple body does well. White tail, pink body. Purple body, pink tail. They have all produced fish like it was Crappie crack.
It's a very easy fly to tie, works better than any I have found, and it is really hard to fish it wrong.
One of these days I am going to have to scan and post the photo of the Crappie I got on a 6" long Reynold's Pike Fly. Not a fish story. If you are surprised, Imagine how I felt when I saw what I had on.