PHOTOGRAPHY AND GRAPHICS BY JAY BOERSMA

THE WEB RULES  
250 GIF images for use as horizontal rules in Web pages, PowerPoint presentations, etc.

White Gray Black

    Vertical blends:

    Horizontal blends:

    Gradients:

    3D:

    Narrow:

    Yokai:

    Objects:

    Etc.:

 

These images are free but there are a couple of small restrictions in their use. Click here for details.
 

If they aren't what you're looking for, try one of these clip art sites: