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Lock Screen Customizer for Windows 8 allows you to change time format, date language, color set and lock screen background. You can even tweak the "default" Lock Screen which you see when you sign out. Also this app allows you to create Lock Screen Slideshow with autochanging background images.

It allows you to change the following options of the Lock Screen:
background image;
date language;
time format (12/24 hours)
color set for sign in screen;
add Lock Screen Slideshow with autochanging background images every time you sign in.
enable verbose logon messages (see video below);
disable Lock Screen.

Note:
If you want to translate Lock Screen Customizer into your native language, then rename the Languages\English_template.ini file into YouLanguage.ini and translate all strings included into that file.