Welcome there fellow Tennessean. Well, you will probably get alot of different answers. The one answer that seems to come up quiet a bit is brush sank out from points in varying depths of water. I personally prefer brush, but I am far from an expert on crappie fishing. There are several guys on here that sink alot of brush, pvc trees, bamboo stakes, woods stakes, christmas trees, death stars, etc. I went early this morning to drop some more brush. It is the second time in a little over a week I have gone to do that. Just hang around a little bit, I am sure you will get plenty of replies to this question and welcome to the board.
ps There is a search option on this board, you could try typing in brush piles or death stars to give you a few ideas. Take care.