Today Google released Photowall, an iOS and Android app that beams photos through a Chromecast to be displayed on a TV. Photos can be doodled on and rearranged in a grid interface that updates as new photos are added.
Photowall works with the Chrome browser by providing a URL that anyone on the same network can access in Chrome to add their own photos and make edits. Once all photos are uploaded, a video can be made and published on YouTube.
Google put together a quick video to show how Photowall works: