In My Themes, the theme in ues at present with custom wallpaper and window color etc, and installed themepacks are listed .
As you use windows 7 professional, it may ge guessed easily that the theme is in use atm uses aero features , and so it is called an aero theme . In personalization window, only the default aero themes are listed under aero . So the themepacks and third party themes are aero themes , I guessed .