The Iron Knuckles of Ocarina of Time and the Darknuts of Twilight Princess are my two candidates that I venture forth. TP's enemies were already realistic, if they had that Crystal Tools spin applied to them, I think they would be absolutely gorgeous (not that they aren't in TP, of course). The Iron Knuckles, while I've yet to see them in OoT3D, seemed to have the architectural make up for an HD twist to do wonders on them. That is my opinion, of course.