DesignPacks.com offer free, high quality image collections that can be use in both personal and commercial web design projects. Each collection features a group of 15 images that share a common theme. They’ve created dozens of collections based on a variety of themes. Every DesignPack can be downloaded as a single ZIP file. File sizes vary between 3-5MB. You can browse the Image Catalog to see what’s available.

Although DesignPacks.com mentioned that there will be new sets added monthly, it seems like they have stopped updating the site since 2005.

Requirements: -
Demo: http://www.designpacks.com
License: License Free