AlltheInterweb's Internet Directory
Building Websites >
Clipart & Backgrounds
Clipart & Backgrounds:
Mike's Free GIFs and Animations - A large collection of free Animated Gifs & backgrounds for your website.
3D Flags - The 3DFlags.com flag collection includes thousands of world and state flag images, in both animated and still clip art formats.
Animation Factory - 500,000 Animated Clip Art, PowerPoint Templates, Backgrounds and Videos.
ClipArt.com - Clipart.com by Getty Images is the largest collection of royalty-free images offered by subscription on the web. For one low price you can download all the clipart, photos, fonts and sounds you need.
AlltheInterweb Directory > Stock Photography - A similar category to this you may also want to look at.