Preferences > Code Editor > PL/SQL Syntax Colors.
There are several themes you can choose from, or you can manually configure everything yourself.
So... What theme do you use?
My guess would be that Jeff is using "Twilight" Scheme with some kind of customization?
Frequently see irish_green colors in Jeff's weekly updates:
but will wait and see what Jeff can tell us about his setup :-)
Also, how can we get this formatting:
Jeff, thank you for sharing.
In my case, it appears that field "Scheme:" is locked up and is limited to 6 choices predefined for me as follows: