I was playing around with bullet the other day and came up with this:
Get a larger version: http://inklein.servebeer.com/images/boom.jpg
very nice, how did you do it in blender?
I used a very large physics simulation and then did a motion blur…
good job…!!!
Very nice! How long did it take to render the whole image? The only thing I can think of is the lack of detail on the bricks, but the motion blur kind of hides that fact. Other than that, nice render! 
I think the render took about 15-20 minutes, but the physics simulation took way longer than that ;).
Looks very nice. The motion blur is a lovely feauture, especially for this kind of animation. Nicely done.
Update: I have uploaded a couple of videos of another tower of bricks, this time animated.
I’ve posted them on my website:
http://inklein.servebeer.com/movies/
Comments?
why dont you try adding various displacement maps to groups of the bricks?