After the launch of Nexus 5 other thing which is popular alongside is the Android's new launcher which indeed is modified Google Now with some Add-on. If you want that new look to your old Device which may be running GingerBread or higher and if you reading this then you are on the right page. Here we will describe you how to give the same Nexus 5 look with the help of screen shots.
HERE you will get the required apps. Install these apps as normal apps, no need to flash it.
Link For the video review