Originally Posted by D.H1cks
I use the WoW Style Skin, so my screenshots show my travel window with that skin applied. It appears that LUA plugins using the base UI Elements like Window, Button, etc... will use whatever skin the user has selected.
You are correct! If something within a Lua plugin uses one of the built-in element appearances, it will go through the skinning system and use the appropriate version for whatever skins you have installed. This similarly applies for the Monster Play version of the UI (i.e.- your addons will automatically start using the "evil skin" when they run on your MP characters).