It's beautiful, Kim. I STILL haven't done the cover on my planner, but I sure am having fun working on my mixed media pages each week.
You can stamp into Gesso, especially the heavy bodied ones. I was just reading about stamping into something after it had formed a skin. Problem is, I can't remember which medium they were talking about.
I think it would work with heavy bodied acrylics. I'll have to find some time to experiment with what I have.