So heres my current conclusion of my tweaking of originally blackcelicas ppfilter (now quite different) and my own weather along with it.
Under options->video->effects: set 'color saturation' to 85%
This is mainly tested and recommended at 17:00-17:30.
Feel free to tweak it further and show us all the results.
Please redownload since there was some error with the original due to the name change, something wierd happened. Fixed now.