Glitter.
Heh: just print a list out of
IMDB's Bottom 100 and throw a dart at it. That could actually amount to an entertaining essay.
If it were me, I might pick a contemporary movie that's meant a lot to me. little_tippler already listed a few that spring to mind. Eternal Sunshine of the Spotless Mind used lots of subtle and not-so-subtle film and editing techniques that help create the world of Joel's mind, and they really came up with some great ideas to show his memories being erased as he relives them. I'd love to spend the the time to write a 10 page paper on it.
I think I'd have difficulty doing Before Sunrise|Sunset, given what was assigned. If I were to analyze them, I'd almost have to just focus on character analysis, as opposed to the filming techniques of the movie. Yet again, they are beautifully shot... so it could work.
Dark comedies might also be fun: Heathers, War of the Roses, The Witches of Eastwick, Election.
Oh, Big Fish would be fun too.