-Ed Emberley's Great Thumbprint Drawing Book (optional)
-markers (sharpies or fine tip work best, but fat washable ones will do in a pinch)
Using the ink pad or the washable marker, get ink all over your thumb (or other finger) and press it down on the piece of paper. You can usually get about 3 good prints from each ink application. After you've got enough prints to start, pick up a marker and start turning those thumbprints into something beautiful. The Emberley book has some great suggestions and you can always come up with your own. Make a mish-mash scene like I did above, or a coherent scene like below.
Miss Lucy's Example:
Bibliography:-Ed Emberley's Great Thumbprint Drawing Book by Ed Emberley