In this article you will be able to see examples of how to customize the various desktop environments on FreeBSD. All configuration files on FreeBSD are under this path:
You can also find the location of the files by using
find / -name
By customizing your system you can completely change the colors of your desktop environment as you like and change the icons, shifts and wallpapers on your system. You can either customize the interface of your installed applications or not.
Below is a video showing how to customize various popular and not-so-popular desktop environments, a kind of BSDporn UNIXporn
BSD is so easy and fun!