If I'm understanding this correctly, you're want to change the icon by the room name in the left hand panel, or at the top of the chat window correct? It's either a lock (indicating a private room) or a pair of people (indicating it's a public room) correct?
If that's what you're asking, as far as I'm aware we don't have built in functionality to change this at the moment, however this is a great idea.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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