Google is adding a wallpaper for RCS chats to make them stand apart from SMS and MMS.
Only one wallpaper is set for RCS chats by default right now.
The wallpaper is more visible if your phone is using a light theme.
Google is assigning a wallpaper to RCS chats in Google Messages. The new background is made up of overlapping circles and makes it easier to differentiate between RCS messages and regular SMS/MMS.
