If your just looking for a place to start, I don't like any of the ones you have. I don't like the use of driftwood covering the rocks in 3 and the whole thing looks to centered and boring.
I would go more with your first idea. Get the driftwood off center and create some height but the height should not be toward the center of the rest of the driftwood. You have to do more with the rocks than put them in a pile though. They should form a visual path that connects with the driftwood.
What makes it so hard to comment is that plant placement can change the whole thing, thats why I don't think there is really a scape yet to really comment on.