STEP 1 - Choose some coffee beans. I go with Intelligentsia's Organic Black Cat Espresso. Amazing stuff, not that ashen acidic stuff you find at many places. This stuff goes down smooth. Grind it, if you haven't already.
STEP 2 - Whip some cream. You can do this in a blender or a cold metal bowl and spoon the old-fashioned way. If you've got egg-beaters that works too.
STEP 3 - Boil some water and soak your beans.
STEP 4 - Pour yourself some coffee (mocha optional). Make sure its hot enough to warm you, but not scold you.
STEP 5 - Add the cream, and pull a cotton swab (q-tip) or shish-kabob skewer across the surface. Experiment. Play with symmetry to get snowflakes. Choose how you pour. You can even get kitty-cats and teddy bear faces if you have a steady hand!