I used to have OBEs almost every night, unintentionally. Usually, the sensation was that I was floating upward a bit, and then forward. I could give up control and my floating body would randomly go upward or straight ahead or to the side, or I could sort of decide where to go. I never got a twisting feeling, but I think I did get a rolling one, and I once 'floated' off the bed and purposely did a summersault in the air. (I could decide to do something, but it would happen slowly, as though I was trying to move through water.) So I can imagine a variety sensations are possible.