In this TouchDesigner tutorial we're using texture instancing in combination with compositing, a Folder DAT setup and some TOP fx to create collages. This is really just the basic approach, feel free to take this further! You could, for example, work with the Nvidia Background TOP to cut out the shapes of people, or simply only input PNG files that already have transparency!

This exact approach only works on Windows. However, you can adapt the system using this tutorial: https://youtu.be/YZ8SbCdjo2o

David Braun's GitHub (grid tox): https://github.com/DBraun/TouchDesigner_Shared

If you like this tutorial, you might also like this one (similiar approach): https://youtu.be/kNCnyUaMZSg