Android 4.0 was created to help unify Android across all devices. Yesterday, Google took that goal of unification one step further. From here on out, any device running Android 4.0 with the Android Market, will require the inclusion of the unmodified Holo theme family. The Holo theme family consists of the themes Theme.Holo, Theme.Holo.Light, and Theme.Holo.Light.DarkActionBar. You can see examples of these three themes in the above image. These requirements will help better control the rampant “fragmentation” of Android and will allow manufactures to continue using their own custom themes, while providing a familiar experience.