Hi there
I saw that the new XFCE-Fusilli had adopted a MacOS theme.
If you want to try this on Fossapup or any other build that uses GTK2/3 , just extract the file attached and place in the following location:
/usr/share/themes
You will need to change the link colours in Rox in order for you to see your text as it uses a black/dark background eg Directory, Regular file, Executable ....
the hex code for white is
#FFFFFF (that's 6x)
at least that allows you to see the changes and adjust to your preference