If you're someone that likes to stick to the stock ROM, or maybe you don't have a root option for your device, then this video is for you. These are five different mods that can be applied to your Android phone without having root. Mods like these will tend to take up a little more battery power when they aren't baked into a custom ROM. If that doesn't bother you, then try these out!
Navbar Apps
Tired of your boring Navigation Bar? Make it awesome! Turn it blue, make it red - anything you want. Select a cool image as background or match colors automatically with the current running app. Add or remove information from your status bar like settings icons or running processes.
Status
Status is a status bar replacement that draws an overlay on top of the system-generated status bar. This means that the actual status bar is only hidden under the replacement; touch gestures are not overridden, and the standard notification panel is still shown.
Fulscrn Free
Fulscrn lets you use every pixel on the screen to provide better experience for reading books, watching videos and playing games. This app lets you toggle immersive mode to hide the navbar and status bar.
MUVIZ Nav Bar Audio Visualizer
Bring your music experience to life with a floating visualization beneath your on-screen navigation bar. MUVIZ is an app that displays a music visualizer beneath your navbar while you are listening to your music.
Energy Bar
Adds a configurable energy bar at the top of your screen indicating current battery level. Plug in your charger to see the cool charging animations activated at the top of your screen.
There are plenty more great apps and mods to look through at the XDA forums.