I have a new app coming to Steam March 6th. It lets you run multiple Indecent (or very Decent) videos at the same time on a personalized video wall. You can customize the layout, set the fit mode for teach tile and much more!
The promo videos have some timid videos for demonstration purposes, but you can go wild and crazy if ya like. Mosaiplay your way. :)
You can find more info on the official Youtube channel!