We've been testing out an excellent suite of database tools for SQL Server here at work from Red Gate Software, and I captured this image while using their SQL Dependency Tracker tool. What you're seeing is a very high-level view of the database for a project I'm working on. Each one of those tiny dots is a database object (table, view, stored procedure, etc), and the lines between them show relationships. The layout is the one automatically generated by default.
I haven't used many database or code analysis tools like this, so it was striking to see such a high level (and admittedly pretty, in an abstract art sort of way) view.