Any themes for the lockscreen?
Don't know what you are really looking for as far as a theme for the lockscreen only. Maybe try an app that changes the lockscreen like WidgetLocker or LockBot.
If you like what I do, thanks
Your can follow me as follows
@dabowerman - Twitter
Derek Bower - G+ - this is where I will be @ the most and where stuff gets released first.
Theming Guides that might come in handy
Theming Guide for Progress Bar
Notification Text Color Change (How to)
Theming Guide for System Text
Yea, as thebowers has said, most themes skin the whole framework of your phone. Look for something called My Lock Pro or something like that on the market. I don't use it but i think it gives you lots of lock options.