Black Lollipop - Blue Theme is a personalization application designed for all Xperia devices running Android Kitkat and newer, including Android 7.0. The app offers a collection of black style themes that change the accent and primary colors on the phone. It also includes a black navigation bar and status bar for Android Kitkat.

One of the best things about this application is that it does not require root access. Additionally, the themes are technically correct, but some problems may arise due to differences in phone models. Users can contact the developer on Google+ for any issues they may face.

It is important to note that the application only works with stock software, and using it with applications like Xposed module or intervening in the application system may cause it to malfunction. The developer has requested users not to use any part of the application without permission.

Overall, Black Lollipop - Blue Theme is an excellent choice for Xperia users who want to personalize their devices without rooting them.