This is a Textual IRC client theme based on the excellent TextMate theme by Wimer Hazenberg (monokai.nl).
Feel free to do whatever you please with it.
Oh, and don't hold me responsible if it somehow breaks something of yours (or anyone else's).
As simple as:
$ cd ~/Library/Application\ Support/Textual/Styles
$ git clone https://github.com/joonas/Monokai.git