Okay....so this one requires some explanation. Well, maybe not "requires" but I'm going to give it anyway. For the topic of "mail," I thought of angels sending messages down to earth, only people have to be open to receiving them, and so I started sketching what that might look like. And once I started sketching (in pen, because that's what I do--I was in the back seat of the car driving to Kansas City to shop for a coat for my son, who was driving), I immediately thought of my all-time favorite poem, "God's Grandeur" by Gerard Manley Hopkins, and an image from the end about how the holy ghost is bent over the world with "warm breast, and ah! bright wings." So this is it. It's a doodle, done almost entirely in the car, and it is what it is.
Here's the whole poem: