The homily is given over to the silent folk and the Jesuits just ask for us to be short about our reflections. It's been over a month but I said something like this:
Walking into this retreat 8 days ago, I was greeted warmly by Father Jack, but just on the other side of him I saw a huge list. I nearly gave up on drawing cards for all of you but your presence here means so much to me. It is how I say thanks for your willingness to be with me in silence. I have received so much. I am leaving here today with a calling to make art and to greet God as I enter my studio. Your cards and thanks are going into my studio as a physical reminder of what this retreat has meant to me.
In my studio window is the cross that goes deep (see Jim's comment) and on my walls are cards and slips of paper containing words written in silence. I stand in my studio surrounded by reminders of how powerful a gift of God can be, if shared with the world.
Then it was over and the introvert, who is not so good at hearing nice things about himself, braced himself for some positive attention. Don't these people know how hard it is to hug someone.
anyway, choosing to enter into a relationship with God is far from easy, not always comforting, but can be down right amazing.