A free app for Android, by Roxanne Crete.

Edge Lighting – Rounded Corner – Edge Notification is a free and easy-to-use application for changing the look of your notifications on your Android device. It lets you choose from a wide range of themes, from simple to more complicated ones. All of them are easy to apply and will give you a new look. It is a great option for those who want to change the way they receive notifications. You can choose from a wide range of colors and styles. 

You can use it as an amazing live wallpaper. All you have to do is to download it on your device.