I did this with my EMDR T a few years back. At first I was like "Uhhhh....I don't know," but she said it doesn't have to be real, anything where you could be that would make you feel calm. What came to mind was an island. I got a poster board and drew my imaginary island. it ended up being fun to do, but i never really used it, but also EMDR didn't really gel with me.