The usual blood clots that I get are no larger than a half-centimeter on every side, in general. I've been getting blood clots of occasionally a centimeter wide and 4 cm long, this time. Things have slowed down considerably; I expect this tampon to last me through the night. There's still plenty of mess to go around, but the exuberant shedding of chunks has slowed down.
Given that I had at least two weeks of constant spotting-level drippity before the torrent, I'm not surprised that there is weirdness. It's outside my norms, but I'm sure it's within the norms of general menstruation.
There were cramps. Bleh. I am attempting to evade more of them through the good offices of ibuprofen.