Hmm. If the point of this is to let people compare styles more easily and particularly their default structure how about always using the same styling combos (as much as possible at least)? I mean if you put a back background to entry titles put it everywhere. If you put a border around entries, put it everywhere. That would also emphasize what isn't possible with this style (which in theory shouldn't happen because all default options should always apply but until we make things perfect...). I know it won't necessarily match the way most themes look like but how different would that make them look (also point #2 is true here too).