While in falcata version the skins cannot be selectable by the user, Pathguard is designed to be skinnable & customizable.
In the upcomming version where the user will be actually able to select them, the skinnin is internaly evolving inside Pathguard, customized verions of PathGuard could be built with a desired skin.
This is an example of a Java interface class which is used as skin template:
So as an skin example you need to inherit the ISkin Interface like in the following example:
Checkout the latest interface as well as the example according to the version in our github.