I'm posting a clip here that's rather long. And the film technique is terrible, for which I apologise in advance - Penny's not even in the picture some of the time.
It's six minutes of Penny offering different behaviors in an attempt to earn treats. I put a chair in the middle of the room (and set up the camera pointing at it) and waited to see what she would do. She knows that if I'm holding a clicker, treats will appear if she eithe does what I direct her to do or if she can do something original.
It's probably not the way free-shaping is supposed to be done, because I didn't offer her any encouragement along the way, but it was interesting for me to see her working on it, and I think she enjoyed it.