Kind of an old post from an old blog, but interesting to see other approaches to micrography. Looks like all of these use text for filler or texture:
Check out The Godfather one… mindblowing.
Not much that looks hand written, though, except for the most traditional ones which are the Hebrew illustrations:
http://www.jtsa.edu/prebuilt/exhib/microg/index.shtml. Again, mostly block filler or uniform line sizes.
(Image from Jewish Theological Seminary micrography exhibit site)