Here is a Skype app concept built with Material Design by Google. Free PSD created and released by IndiaNIC.
Freebies tagged skype
A redesigned dark user interface of Skype for Mac. Free PSD released by Alexandre Naud.
Skype for Mac UI
Free PSD UI of an incoming Skype call window designed by Giorgio Pia. It contains a small avatar and buttons for answering/closing the call.
