Very interesting! I'm convinced humans looking at code plots can see things that computers can't. An extension of your idea is to show how code changes over time. Sections that don't change much = "backbone" of system, probably bug-free. New code, or code that changes a lot = "sketchy", might have bugs. Alternatively, show code colored by "quality" i.e. complexity.
Here's my take: https://github.com/johntellsall/shotglass#demo-flask-a-small...