This second vizualization is more of a workflow proof of concept compared to some novel visualization but I can guarantee you haven't seen the SCOTT.EMP table like this before. I have wanted to combine my two favorite tools for a while. Here is how you can drive a d3.js visualization directly from a SQL Developer custom report.
I enjoyed giving my presentation on SQL Developer User Defined Reports to the 2014 East Coast Oracle Users Conference. This is a local conference that is a great value and pulls in lots of fun folks that attend and present.