I've had some tutorials online, but its mostly just changing the authui.dll from the System32.
here's the ones that I used. Be careful when you edit it though, if you mess up you'll be stuck with a black screen.
http://www.neowin.net/forum/topic/879070-windows-7-logon-editing-guide/
http://www.askvg.com/how-to-remove-branding-logo-and-ease-of-access-accessibility-button-from-windows-vista-and-7-login-screens/
http://superuser.com/questions/552743/how-to-remove-the-user-picture-from-login-and-lock-screen
http://superuser.com/questions/706625/how-to-get-a-sleep-button-on-the-log-in-screen
http://www.techrepublic.com/blog/windows-and-office/change-and-customize-windows-7s-logon-screen-wallpaper/
http://www.sevenforums.com/tutorials/63025-ctrl-alt-del-start-menu-add-remove-switch-user.html