VLC player allows installing extensions, plugins, skins. They have to be copied into a folder: for example, its
.lua extensions should be in a folder with the same name. Where is that?
Once installed, they are to be found under 'View'
(I put them here for illustration, I do not recommend all of them.)
Skins are installed by going to Tools/Preferences(Ctrl-P) - Interface: 'Use custom skin', and select the skin file.