I fish Possum Kingdom at night allot in the summer and catch quite a few crappie. Minnows work best but I've used a white jig by Giltmore tackle (fuzzy bug) that works well. Works even better when tipped with a minnow.
The places I fished were where a mercury light was close to the water drawing minnows naturally to that area. During the day, that area had very few fish but by nightfall the fishfinder was solid fish. I would use a 10 foot pole and pitch out about 12 feet of line and let the jig arc back to me. I'd either get a crappie or big perch almost every time.
Green lights have not worked well for crappie at night at PK. They draw too many sandbass and no crappie smart enough to live to be 10 inches will illuminate themselves in that light. Too many big bass, cats and stripers.
Good luck to you.