Hello Rahul,
sorry for the delayed response.
You can find information how to assign the standard Fiori login page for any other application (technically: ICF node) on NW AS ABAP here: Configuring a Login Screen for the Launchpad - User Interface Add-On for SAP NetWeaver - SAP Library
(this describes how to configure it for the Fiori launchpad, but you can apply it to other applications).
While searching for this, I also found this SCN blog about customizing the standard page, maybe this is interesting for you, too: http://scn.sap.com/thread/3518534
Best regards
Heiko