From the developers of MIUI ROM comes MiLocker - a FREE lockscreen replacement app similar to that of WidgetLocker! This app has lots of nice lockscreen themes from WP7 Metro style to Android 4.0 AKA ICS Lockscreen styles! The best part of all it is FREE and is an independent app with no special requirements other than requiring your phone to be running on Gingerbread AKA Android 2.3 at minimum.
You can head on over to the link below to grab this fantastic new lockscreen app:
MiLocker (FREE) - Android Market