This is a subject I always admire!
It amazes me how they think up the designs up then the skill they have in putting it all together.
http://www.flickr.com/photos/tee_gee/sets/72157626525952400/show/ (http://www.flickr.com/photos/tee_gee/sets/72157626525952400/show/)
ps This is the 2nd time I have uploaded this file but could not find the first one, so if you have seen before; it then enjoy it again
Some clever work here.