Dialogue and lots of it! I'm a sucker for those old movies where there was actually more talking than action....
What I have written so far has all been in third person limited omniscient pov. I can't seem to write anything less than 1,500 words for a one shot. The story I'm currently working on is going to be 12 chapters ranging from around 1,500 words to well over 6,000 words each. I can't imagine writing anything longer than that. I am concurrently working on another medium length story where the pov switches between the three main characters (a love triangle). I was hesitant to do this at first because I really hate stories where the pov shifts around a lot. I think it's rather difficult to do multiple pov's well, but hey, I gotta try it at least once.
I really admire writers who can pull off a stream of conscious style, but every time I try my hand at it it turns out like crap.