this requires root access on your device.
It will work with custom roms or moreover maybe if you installed Heathcliffs new WP7 Root Tools 0.9!
jaxbot has official released the final lockwidgets 2!
The app is a rewrite of the original popular LockWidgets application, and adds data such as battery or weather to your phone’s lock screen.
jaxbot has official released lockwidgets! You can pin weather, rss feeds, twitter-news, and ram-info on lockscreen. If someone has problems with tranparent lockscreen, uninstall dynamic background and try it again. The service for Lockwigets will be shut down in near future.
"The app basically allows you to set a dynamic background, either the Bing background of the day or a custom slideshow, and the app will update the wallpaper with a background task."