Instance Instance Instance Instance ...

Nothing saves time like instancing.  In this case, I mean instancing in the Welder sense, not actual scene geometry instancing.  It resulted in a pretty cool field (of only 300k tris!):

The very sad thing is that, while posting this, I realized why the small asteroids look somewhat axis-aligned.  I scaled after I rotated.  Facepalm.

Well, expect at least one more image tonight...