How to form a mosaic picture by using GIMP or another app. by using other pictures?

How to form a mosaic picture by using GIMP or another app. by using other pictures? How can I create a mosaic picture by using GIMP or another app. by using other pictures like below?
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bert [Entry]

"Take a look at AndreaMosaic

Here is a guide that Engadget did about five years ago on this software.

AndreaMosaic, a free project to create digital art using images and computer software. With AndreaMosaic you can create your own photographic mosaics made with your own pictures. A photo mosaic is an image composed of many tiled photos."