I've got a couple that I use for panfish in general but crappie seem to like them.
A fly I call an Estaz Bug works real good. Fairly simple pattern.
Tail: Marabou over about 10 to 15 strands of crystal flash
Weight: 6 or 7 wraps of lead wire in center of shank
Body: Estaz wrap around shank, then trimmed short. Creates a grub shaped body.
Pearl/white, chartreuse/charteuse are the most productive colors.
A small Crease style fly about 1 1/2 inches long.
Light blue/silver MOP, Light Green/silver MOP, Chartreuse/Silver MOP and Bronze/Silver MOP
A Polar Fiber or Fuzzy Fiber minnow 1 1/2 to 2 inches long. Same colors as the Crease style fly/white.