OMG!, this is the coolest addon ever. Jonathan shows how to use the Masonry addon in his latest BlenderCookie tip tutorial. In addition to showing the addon, he shows you how to easily use arrays and the deform modifier to create a cool circular courtyard.
I can see so many uses for this addon to create fun models. Beyond the obvious fantasy/castle wall idea, you could make old stone walls, stone cottages, roads, plazas, wells, towers. Delete bricks/stones here and there and start creating your own ruins or maybe an archeology type scene.
hmmm, creative brain buzzing on overdrive. I just love the possibilities.