With PhotoMosaique you can create picture mosaics very quickly and very easily. The final image is made of a thousand tiny images (thumbails). Unlike other similar softwares PhotoMosaique allows you to obtain a good result using very few thumbnails. However an optimum result requires big pictures and it is rather difficult to visualize the final result on the screen, this software is therefore intended more for printing.
PhotoMosaique will give you about forty standard thumbnails but it is preferable to use your own thumbnails for enrichment of your database.
You can also create several thumbnail databases by sorting and filing them by category (nature, funny, portraits, flowers, ...)