How to customize Fiori login screen ?

There is many discussion explain about how to style the login screen for Fiori launchpad designer (Admin) and not for the Login screen for Fiori launchpad it self for the end-user.

I already went through the following:

https://help.sap.com/saphelp_uiaddon10/helpdata/en/6e/d6c296810e4218a37240ebdcfc7950/content.htm?frameset=/en/2a/ec20ffda5c457d898dfb822e2a7bd3/frameset.htm

Which is for the Designer (Admin) not for the end-user login screen.

In this discussion I am asking how to change the login screen of normal Fiori Launchpad for the end-user to reflect the company brand (Look and Feel) ?

Here is how my login screen look like for the Fiori Launchpad (the normal one not for designer admin):

Image may be NSFW.
Clik here to view.

Here is how my current Admin / designer login screen look like:

Image may be NSFW.
Clik here to view.