Oh, ... we'll something like this might work. You may need to tweak the sytnax a bit.
HTML Code:
<if condition="$forum[forumid] = 1 OR $forum[forumid] = 3 OR $forum[forumid] = 5">
<img src="./board/images/logo/logo-xbox.jpg" />
<else />
<if condition="$forum[forumid] = 2 OR $forum[forumid] = 4 OR $forum[forumid] = 6">
<img src="./board/images/logo/logo-playstation.jpg" />
<else />
<img src="$stylevar[titleimage]" />
</if>
</if>
</if>