Ink Stamp

1. Type in your Text and Rasterize it (you can also use an image)

2. Select the Text (CTRL+Click on the Layer Menu)

3. Apply >Filter>Render>Clouds or paint white areas if you don't want a random result.

4. Add noise.

5. Blur

6. Adjust the Contrast/Brightness until you get a good looking stamp.

7. Select the black >Select>Color Range

8. Invert the selection (CTRL+SHIFT+I).

9. Delete

10. Apply >Filter>Noise>Median

Voilà!