Install the new Material Design keyboard from Android L!

If you have a Nexus 5 or 7 you can install the Android L Developer Preview, but if you still want to experience some of the features of Android L now, this is your chance!

Bejunk over at XDA ported the keyboard and shared a flashable .zip that will give you the new keyboard with the Android L Material Design theme.
The keyboard is said to work on “probably all ROM’s based on 4.4.x.”

To enjoy this material design, your device must be rooted, but there's also a non-root apk tested on Moto G so give out a shot & try that.
Instructions about how to flash the .zip & links to download can be found in the source link below.
Source : XDA-Developers

Update : This keyboard is uploaded on PlayStore after some tweaking, Check this link (no root)