You have probably seen those impressive photo mosaics where a large photo is created from "pixels" that are actually other tiny versions of other photographs. Here's an example:
This looks hideously difficult but if you use the free utility Foto-Mosaik-Edda it is dead simple.
It works like:
First you create a database of photos that the program can use for the "pixels." Technically these are called "tiles."
This tile database should be as large as possible - at least 2000. You could for example use your entire family photo collection or simple drag them in from Flickr. Photos may be in gif, jpg, bmp, png or hpi formats.
Once you have created the tile database you then specify the picture you want to turn into a mosaic. That done, Foto-Mosaik-Edda does the rest for you automatically.
The whole process is driven by a wizard and is so simple that even a novice could do it. The spectacular results are completely out of proportion to the little effort needed to create those results.
Many people will use this for family photos that are built out of other family photos but you could use it for promotional or creative work as well.
As the website says: " ... amaze others with this extraordinary effect."
Freeware, Windows 2000, Windows XP, Windows Vista, Windows 7, 911KB
Thanks to regular contributor Panzer for the suggestion.