Andreamosaic is great free software that allows you to create a photomozaic. Essentiallt this is a mozaic of 1 photo constructed of a couple of thousand smaller photo's. Great stuff!
Sadly 'or happily' the author has sold his source code to a software company and Andreamosaic is no longer available for free download from the original site.
However, this older version is still freely distributable.
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