All smartphones have a default clock but they're quite boring in all honesty. So, if you want to enhance the look of your device and upgrade the clock into something more interesting to look at.

The app is called Blue Slate Zooper Widget Pack App and it does an excellent job of transforming not only your device's clock but also your icons. The graphics give off a comic-ish style and have vivid colors that pop out of your screen.

Apart from that, it also provides cool widgets for Google services. It works on Android phones and tablets. 

Important: Blue slate requires Zooper widgets PRO TS PRO™ to work.