HKEY_USERS\.DEFAULT\Control Panel\Screen Saver.Marquee:Text=Whatever text that you want is here.
HKEY_USERS\.DEFAULT\Control Panel\Screen Saver.Marquee:Speed=10
HKEY_USERS\.DEFAULT\Control Panel\Screen Saver.Marquee:Size=40
HKEY_USERS\.DEFAULT\Control Panel\Screen Saver.Marquee:Font=Times New Roman
I have never seen a setting for the background color. Doesn't mean it's not in there somewhere....