Actually finishing is a challenge, LOL! I have like 200+ outlines but only about half a dozen complete stories and one semi-complete novella. #1 sounds interesting to me 'cause I like horror stories, as well as that old cartoon "Fractured Fairy Tales" :) Your idea #2 reminds me sort of of the premise of Heinlein's "Coventry", which you might find inspirational if you haven't read it yet. On #3 I'm working on a nano-themed story but have no idea what's already been written--I should probably research that.
I promised my friend today that I would try to finish something before next Tuesday - we've been having Tuesday work-n-chat for the last few weeks; get caught up as we sit at our computers and do what we're doing... I told her she had to make some progress on a piece she's been doing for over a year, and she said I need to write something. (Her final deadline is Christmas, as the story is called "Advent")
So I need to write something. First-person POV, short story, something I don't usually write... and interesting.
But before I do that, let's procrastinate and spend money buying those Card books...
There's a good one called The Diamond Age by Neal Stephenson. A what-happens-after? story