From here, you can download ...
Note that downloading one of these mazes a second (or third, etc.) time will result in a different maze on each download.
(inspired by http://www.ccs.neu.edu/home/shivers/mazes.html)
Basic code for maze generation available at https://github.com/mds2/mazegen
Code to make this appengine page available at https://github.com/mds2/appengine-mazegen