An XDA user has ported Samsung Galaxy S6 user interface to the Grand Prime. This is great as S6 is a premium phone and grand prime is a mid range phone with premium build quality.
Samsung Galaxy Grand Prime: Download Galaxy S6 UI
How to install instructions are given below. But before you proceed you should root galaxy grand prime as it requires super user permissions.
* First make backup of your old app.
* Delete the arm folder and apk file
* Copy my zip to the destination folder (destination is already written in the zip). Set permission to rwrr using any advanced file explorer for Android.
* Reboot and enjoy.