They should work. I prefer soft plastics over marabou, but maybe that's a regional thing. Ratsos and Shrimpos, the 2 Customs Jigs and Spins lures are soft plastic jigs with teaser tails that are simply awesome and are available in several glow colors. Read my post under the shrimpo post for more details on how I fish them.
My suggestion would be to use a flasher if you don't already. Like Jigwiggler posted before me, crappie tend to feed up and are often suspended, so knowing what depth that they are holding really helps. Also, most crappies are night biters too and fishing with a bright lantern or submersible light is useful to attract baitfish and crappie. However, to your question about the marabou jigs, they work too if you put them in front of their nose. Again, the sonar is a must. Try tipping the smaller ones with maggots or the bigger ones with small minnows too.
If you don't own sonar, try rigging 3 in tandem a foot apart and work different depths systematically in areas that you know crappies are. You can find those areas if you catch a crappie during the day, chances are they will feed more heavily in that area at night as well.
