Hey, @marcuz! Thanks for writing in, and what a great question! As of now the best way to do this would be a combination of creating a Custom Post Type in your child theme, and then referencing that Custom Post Type via a Looper, which you could then randomly order.
To do this, you’d need to first register and setup your Custom Post Type. There are a couple ways you can do this either via a plugin that helps you create one from within the WordPress admin interface, or you can manually set one up in your child theme. This article somewhat walks through the idea of both approaches:
Once you have you Custom Post Type setup, you could have it include fields for things like the user’s picture, their name, et cetera. Basically, anything you’ll want to reference later in the Looper.
Then, you can go setup your Grid and its Cells to be a Looper Provider somewhere in the tree by activating the Looper Provider under Customize, then going to the Query Builder and pulling in your appropriate Post Type. Finally, you can use the Orderby control to select a random order each time. If you haven’t used Loopers yet, we have extensive documentation and videos on them here:
That would be the best way to do something natively within the tool.