Which of the following do you wish you could've made yourself? Not you want the glory or success of the creator, but you wish you had the capacity to make something that good. And don't pick obvious things like Shakespeare or The Wall.
Book/Series of books:
I, The Jury by Mickey Spillane. Or any of the Mike Hammer novels. Because it was both the culmination of the hard-boiled detective genre and took it from the past into the future, and the writing is just compelling. You start the book, you have to keep going. AND HOT!
Anime/Manga: I have no idea. I'm told Bleach is good. Let's say Bleach. Never watched it though. (I've never watched ANY so I'm copying this answer directly from kiwi_from_hell.)
Album: Bryan Ferry-These Foolish Things.
Camp/Glam covers, for the win, especially the version of "Piece Of My Heart."
Old Movie: The Big Sleep. (Bogart/Bacall and dirty racing talk.)
Newer Movie: Apocalypse Now (A singular vision and Martin Sheen's voice)
TV Show: House MD-Seasons 1 & 2.
Johnny Carson Tonight show monologue from the 70's or 80's.