Interesting, good for cities...
In the meantime I found that using the blocks in a vdisp setup doesn't work as expected (well, I expected it, so maybe I should say 'as wished for'). Only at one side it works, but on the other side the cubes displace inwards, which is quite logical. So you either have to vdisp per terrain angle, or simply use (lateral) displacement after a tight compute terrain or compute normal. Really nice rock effects are possible though.....