you might consider these :
dark blue body - light blue tail
dark green body - flo yellow tail
light blue body - chartreuse tail
The first is for a light/dark/light contrast combo ... clear to stained water use
The other two are "bluegill/sunfish fry" colorations ... to mimic their sunfish cousins (which we all know are both predator and prey, to a Crappie)
... cp