Dark colors in green, blue, black. Shad patterns. Pinks, orange, florescent colors. Get red hooks if available. Crappie fishermen are like bass fishermen, you don't sell the bait to catch the fish, you catch the fisherman. Any pattern will catch fish if you have confidence in it and keep it in the water. Don't think of a crappie crank as some tiny, wimpy deal. We catch a lot of BIG crappie on large bass baits. Also, deeper is not always better.
I paint my own so I have some customs patterns that no crappie or crappie fisherman ever thought of.