By default, Windows 7 displays the blue logon screen.
If you do not want the default one, then you can change it in two different ways.
You can change it using software or by manually. Let's get started.
Change Windows 7 Logon Screen
Change Windows 7 Logon Screen using Software
"Windows 7 Logon Background Changer" is a free software which helps us to do this task quickly and easily.
This software comes in portable and installable version. Pick the one you prefer.
Change Windows 7 Logon Screen Manually
In this method, you need to edit the Registry.
So before making any changes to the Registry, I suggest you to take a backup of the Registry.
HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Windows > CurrentVersion > Authentication > LogonUI > Background
Note: Selecting a new theme will change this value to 0, and you need to change this value again to 1.
Lock your PC (To do that: press Windows key + L), and you can see the change.
I suggest you to go with the "First Method" because it is easy and you do not have to edit Registry.
I hope that the information in this guide is useful to you.
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How to Change Windows 7 Logon Screen