Looks like Cal Henderson from iamcal.com decided to design his own interlocking Carcassonne game out of Legos. The design is amazing and I would love to make a set myself. However, after reading the comments where he said it would cost upwards of $25 a tile to order the individual pieces through LEGO I believe I will have to hold off.
I really do love the way this looks. Even if the tiles would be hard as crap to place in a crowded board.