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OK. Step by step:

1.  Place your sample image(and only the sample image! nothing more) in a separate document.

2.  Ctrl + click on it's layer in the Layers Panel. You should have the selection, denoting layer's opacity.

3 . Go to Channels panel. Make a new channel from the selection(Save selection as a channel). Turn off the selection(Ctrl-d). Select your new channel.

4.  Invert the channel. (Ctrl+i)

5.  Go to Edit->Define Brush preset... Save your channel as a brush.

6. Go to your target documentl.

7. Choose Clone Stamp tool, choose the brush you've just created. Turn off the Aligned mode.

8. Place your brush over the sample image in it's document. Align it carefully, brush outlines would help do it(press Caps Lock if you don't see outlines). Press Alt+click.

9. Go to your target document and single click on it wherever you want.

Hope it helps...