I started by stamping very lightly in crumb cake, then used a coffee paint I had made earlier. To make the coffee paint, I added the last bit of coffee from the pot to a small watercolor paint pallet. You can use a Styrofoam egg carton, a small saucer, ramekin, whatever. Let it dehydrate, then add some more with your next mornings coffee. Do this for a few days and in the end you will have a little paint pot to use like a watercolor.
I love to watercolor, and using coffee is just another fun way to do it. I first tried this in an adult art class I take while the kids are at school. Shown here is a bigger coffee painting, and a little coffee comic I made in class last year.
I made a little video to show you step by step. I hope that you will give it a try.