I'd love to write a really good acid western. So far all I have are daydreams about being a badass old west drifter to the music of Spindrift.
Edit: I suppose there's also what I started when I tried (and failed) NaNoWriMo, which was a horror story about a pathogen that made people deranged killers of a spectacular nature. There was a fight in a stained glass factory, that was kinda cool. Should see if the laptop with the draft still boots...
(If I recall the movie correctly, it was basically The Crazies, but more violent and written before the 2010 version came out [never saw the 1973 version])