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.

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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