Tweaks.com Logon Changer
Full user review
"I like having family pictures on my welcome-screen"
I've changed the welcome screen manually before by making registry changes and putting the jpeg file in a special directory and found that was a little tedious. Logon Changer made it a lot easier. It is easy to use.
I have no negative impressions about Logon Changer.
If you want a change from the windows 7 welcome screen give it a try.