Some time ago I have written the post about creating custom login page for SharePoint 2010. Many visitors asked me whether it works also for SharePoint 2013. The answer is: probably yes :). I haven’t tested it, but it should not cause any problems.
This way or another, I’ve decided to rewrite the page to be 100% SharePoint 2013 comaptibile.
At the end of this post You will find everything what’s needed to implement the solution in Your environment. Enjoy!