You’re going through his photostream faster than I am, I haven’t gotten there yet.
That is pretty cool though. Whenever I’ve seen buildings like that, I’ve always assumed that they’re snotting this piece to get the effect:
http://www.bricklink.com/catalogItem.asp?P=85984
A very quick look at BrickLink suggests that Cale’s technique is much more cost-effective, plus visually it’s more subtle and therefore more realistic-looking. I don’t know if he has problems getting them to stay in nice and neat, I am always wary of putting pieces in clips that aren’t specifically designed to go in them.