I was fishing a reservoir for crappie, gills & Perch. For several hours fishing was medioce at best despite trying different warmwater flies. I put on a Colorado Caddis which I use for trout in still water. The crappie literally ate the fly up. Some swallowed it so deep that removing the fly was a task. Since I was fishing for food that was OK by me.
Here is a picture of the caddis if you want to try one. Sorry for the poor quality.
Tim