A quick look at [Ed Spence's page][1] reveals two such examples: (7,3,3) and (16,6,3). If there is a known classification and/or name by which such designs go, I'd love to know about them too. EDIT: I am specifically interested in designs where at least one pair of blocks has a nonempty intersection, with multiple blocks allowed. A slightly off-the-beaten-path kind of object, perhaps. [1]: http://www.maths.gla.ac.uk/~es/bibd/nonsymmdes.php