Okay, finally got the damn blizz styling done when an admin/mod posts in the viewtopic body template (not in viewforum etc yet though).
Now I just need the following and viewtopic will be just about done:
The direct link to the avatar of a user, also in viewtopic_body.html. I can only find {postrow.POSTER_AVATAR} and that has additional attributes in it and besides renders it as an <img> whereas I need it as a <td style="background: url('avatar_url_here')">. So I need something like {postrow.POSTER_AVATAR_SRC} instead of {postrow.POSTER_AVATAR}.
Although I think I have to create this one myself (I hate modding sourcecode just for a template :S)
edit: nevermind, got it working through some source haxing