Microsoft seems to be really keen on allowing Windows 10 users more customization power in the next update it launches for the operating system, and the company has already acknowledged this.
And now we are getting signs of where things are heading.
Basically, Redmond is now working on some subtle tweaks to give users more advanced ways to change the default configuration in the OS — got to admit, Windows 10 is still quite rigid in some areas, and it is not possible to change things around without the help of some third-party utilities.
But luckily, some changes are afloat.
Build 10547, for instance, comes with an option that allows users to use the Windows background picture on the sign-in screen.
Finally.

Only the background picture is supported for the time being, but there is no doubt that Microsoft will enhance this feature in the near future and add more functionality.
Speaking of third-party applications, a few are already available that easily allow for the possibility of using a different photo with just a few clicks.
That said, users, undoubtedly, prefer to see this directly integrated into the operating system.
Windows 10 build 10547 is one of the newer versions of the preview, meaning it could take a while before Microsoft makes this option available in the final version of Windows 10.
Within the next couple of months, be a solid bet.
source:windows10update