Once rooms have a meaningfully concrete implementation (T7566), we should evaluate restoring the custom image feature for threads.
We may not need it, but if rooms end up fairly freeform (e.g. "Social", "Funny Cat Chat"), not bound to projects/objects, this would probably be a good feature to restore.
I notice that the user image of the first person added to the Conpherence is used as the image. Could we somehow allow for the creation of a custom Conpherence chat image? I know the framework already exists on the context of Projects.