Here are some sample watermarks you may use if you don't wish to make your own. The photos show examples of how the different watermarks look. Here's how to save them to your computer:

The actual watermarks start at image #16 in this gallery.

1. Click on the image, click sizes: O (for original) want this one? Go to step 2.
2. Click on "save photo" and save it to your computer.

Feeling more adventurous? Here's how to make your own.