I've fished a float and fly for years with marked success. An adjustable slip float, clear plastic and a long leader to the fly. Cast it a mile and then reel back slowly.
I have tried still fishing it with very little success but I'm not fishing for crappie. I have had my best results with a jig on the bottom and a fly about 2 feet above it on a line from a nail knot about 4 inches long.
Give a twitch and settle and then repeat.