That's not quite what "white label"means in a lot of places.
Anyway, what you're saying is that you want to do some branding on the software - there is some flexibility in the themes you can use within it, yes. Whether it's customisable enough for your desire - not sure, as I don't know how deep into the rebranding you want to go. You'll need to retain mention of HipChat and Atlassian in it, but the rest could, in theory, be changed.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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