Windows 7 Login Changer is a free and open source changing application that's straightforward.
Here is a screenshot to illustrate the features and user interface of this application:
Comes bundled with only a few features for helping you change the logon background image of Windows operating system. Screenshot of Windows 7 Login Changer - 500px · 642px
7+ Taskbar Tweaker
Easy Dark Mode
Open Shell
DesktopOK
Earthview