Black lake pt 2

I had a look through these:

And decided to make a tower in the middle of the lake and even got quite far with it:

The idea is that there's some kind of a building in the middle of the lake and it's getting covered with vegetation and somebody's trying to repair it. However there's something I don't like about it and I can't quite come up with a good story for it.

So I came across these:

 

http://www.criteriondg.info/wordpress/uploads/scott-wills.jpg

and thought I could make a dome where the opening of the lake is. I was struggling to figure out how to make a believable rock mesh.

Devil's causeway in Ireland has these six angled basalt towers. Because they sit next to one another perfectly if I can just make one and and make a nice composition of its uv mapped duplications. I get away with minimum uv mapping and the whole scene will be easy to manage.

I can't really draw this out so I've been sketching on maya.

It's still very rought but proves my point. The six angle blocks look believable and give the scene a nice surreal touch.