Stamptransfer6
Amy at Craft Chi has a tutorial on inkjet transfer stamping — a way you can create your own stamps by using your inkjet printer to transfer the stamp onto your paper crafts project.
Amy writes:

Have you ever wanted to make a rubber stamp from a digital image or text? It’s easy to mimic the look of a rubber stamp using your inkjet printer. Simply print your image or text onto a smooth, non-absorbent paper and transfer onto a receiving surface while the ink is still wet.