I like the maemo.org style header, but I still think there should be some kind of talk.maemo.org-specific thing on there, something that is calculated from posts and thanks within the forum*. Perhaps a combination of the first two suggestions?

I still think that if you hit a certain level you can choose from a set of oddball names, like "Sardine", "Elephanta" or even a custom one.

*Disclosure: I'm proud of my post:thanks ratio on ITT, so I am biased here.