There's been a fair amount of neck pain in my life lately. Several of my clients have reported it, I've had a bit, and the weather has been a royal pain in the neck, too. I've used the Yes-No-Maybe So Undulation to relieve the stiffness and creakiness. Here's a video.
You can also do this sitting in a chair or standing. The "Yes" part is a bit more difficult, but the "No" and "Maybe So" are easier, especially when standing.