Generally, the themes, skins, or any type of graphics aspect changes, are meant for operating systems and multimedia player programmes. This means that the applications that have a bit more important functions and are little connected to a graphics aspect in and of itself, do not contain any types of image change.
It is for this reason that thinking that an antivirus could have a skin is something completely rare and unusual.
Though it may appear strange, aVist is a fabulous skin for the Avast! antivirus, that offers the possibility of completely modifying aspects of the graphical interface. In this way, the simple graphic surroundings that Avast! has will change in its totality and will largely resemble the applications of Windows Vista.
If it is not possible to load Windows Vista onto a computer, at least one of the applications will have a very similar aspect.