Image Mosaic Wall is a free and open source Image Wall Photo creator using lot of other images for Linux and MacOS. It will create a mosaic effect photo using other images. It is released under GNU GENERAL PUBLIC LICENSE Version 3. It comes with easy to use user interface. Just select your output image and the image folder that filled with lot of images. Set the Variation output resolution and the Grid settings. After that click the Create Mosaic button. You can also save the image.