I have done it but I don't know how happy you will be with it.
I would like to have been able to change the background to dark like FetishNightFall but the included scrollpage.xml has color codes for each text element. These colors don't show up very well on a dark background. I would prefer to set them to LightBlue's and Yellow's like the Journal entries are colored.
It would not be difficult to change the colors the first time with a search and replace, but updated files would overwrite those changes (I assume).
If you would like to give my attempt at skinning for FetishNightFall you can pick it up
here.
If the authors of POIFinder can provide a Style sheet for element colors, it would make skinning much easier. Not sure if that is possible given the current design.
Cheers.