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Ah, Substrate is a screensaver: It avoids the loose ends by starting seeds directly on existing lines. I was acting like you'd heard of it because I've seen it mentioned a couple times in the context of history of procedurally generated art.

Having played with the code more, now I understand that the objects are rendered in one at a time to give some appearance of depth. It does look like there's a setting for number of starting seeds which gets used on a few objects.

It might be interesting to produce some symmetry by having some objects which place two seeds at a time, symmetrically.  Maybe that would be a solution for getting more face-like things to appear.

Anyway, I'm enjoying poking around in your old project. :)