General :: Little App Or Widget / Button To Just LOCK The Screen?

There seems to be plenty of adequate little homescreen button apps to lock the screen. but they turn it off at the same time. I want the option for both. I already have one that turns the screen off, now I want a different one that just brings up the ICS default lock screen (the one that shows up just after turning the screen back on or at OS startup - if you set it to have lock security).

I'll put em in the icon group on the home screen.

It's cos sometimes I just need to lock the screen while carrying the phone for a short while [and don't want to touch something while grabbing it by the screen], then easily [without having to press the power button] unlock phone again to resume using it once I'm done carrying.

Without having to be its own lock screen app -