When I bought one of the two Warhammer Quest boxes I own, the contents were supplemented by a white metal wraith king on a throne. I believe it to be an old Grenadier Miniatures set, but have not taken time to check it.
Anyway, it screamed "Return of the Withchlord" to me, that's one of the Hero Quest expansions for those of you unfamiliar with HQ.
So I took my cue and tried to paint it up like the cover art of said expansion.
I love the little details all over the base and this will make a very nice centrepiece for the final mission of this Quest I am sure.