Well, I did go back and get the ghost plant, Graptopetalum paraguayense, that looked so wonderfully lavender. Now, I'm pretty sure it is the same plant as one I already have and I'm not sure why it seems to have more color. It might be a function of how much sun it gets? The one I have is in full afternoon sun. Here's a picture of it.
The one I just bought was sitting under shade cloth. I've put it in a shadier spot for now to see if the color stays.
Even if they are both the same, I really like them and I'm glad I got it. I just went back and found the thread that says color change is a function of temperature. It's possible that the new one was in cooler temps, a lot of the nurseries here get plants from the highlands where it is much colder.