I love them all!

When I wrote my post I was thinking along the lines of having a making kind of a sliding in a circular motion in the right corner top or bottom, like a 1/4 circle, so it could be easy for landscape or portrait.

Currently if the phone is in portrait from the videos that I've seen it just looks so silly to unlock it

My thought kind of incorporates the "N" idea tracing a shape rather than a straight line, and probably can have some colors like the rainbow idea (I know not an accurate description)

-Another more for "security" like you were saying was to implement the wheels like when setting up the dates in the setup, it immediately reminded me of a locker combination type deal to unlock the phone.