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I have always loved Sublime Text's Monokai theme, as it was easy on your eyes and it looked nice, so I decided to re-create it for the PDE.
Here's a screenshot:
There's a few issues with the theme that I can't fix at the moment:
=or numbers, but the PDE syntax highlighter doesn't support these
But despite that, I still tried to make it look as faithful to the original as possible.
Here's the GitHub repo: processing-monokai-theme
Update 2018-04-16: Fixed the selection color to be gray (original) instead of orange. This was a thing that I overlooked, fixed locally, but forgot to add it to the repo! Hopefully the orange didn't cause too much eye strain for you.