If you want to make your Windows 7 look more hip, customizing the logon screen might not cut it anymore. On the other hand, replacing the lock screen with a drop of Windows 8 may have the desired result. Not to mention that it is easier to flaunt a lock screen than a log on/off one.
WinLockPro, currently in beta, seems to be the right answer to such a customization, as it offers a different lock screen, similar to what Windows 8 has. It is not a proper lock (Ctrl+Shift+Del works unhindered), but it is an awesome make believe, as once clicked, the image switches to a password screen, asking for the correct countersign.
Aside from adding a bit of Windows 8 pizzazz, WinLockPro can also be used to change the username, set a different password, modify the background image or customize the profile picture.