To make the start screen of wp 8 less cluttered, less like iOS/Andriod (the new small square tile looks a lot like iOS/Andriod icons), i think a smaller rectangle tile size should be added. It would also complete the tile size series: Start with the big rectangle size, this is then divided in half to the big square tile, this can then be divided in half to the suggested small rectangle, which could finaly be divided in half to the small square tile.
Do you agree? :)