According to Microsoft, if you don't to use voice communication, you can use Microsoft Expressive Pixels to communicate through an image you create and displayed through and LED display. Microsoft Expressive Pixels is available in Microsoft Store
Microsoft Expressive Pixels provides rich authoring capabilities for users to make static images and animations that can be shared on LED displays and other digital devices such as a PC. It empowers people to create, express, connect and share animated visualizations in their own unique way.
I am not sure how useful it will be for me. Microsoft allows you to create yourself or use the community gallery.