I stopped by to see other responses, just because this is an interesting subject to me, and I realized I didn't answer your "why" question. DEAD GRAY would make a great indie feature for several reasons.
One, it's got a pretty tight three-act structure and a revelatory climax.
Two, it's got a limited cast. Two main characters, two secondary characters.
Three, it's got limited locations, and they're mostly interiors. INT. HOUSE, INT. DINER, INT. APARTMENT, INT. HOSPITAL ROOM, and a few brief exteriors.
Four, it's visual. Main action isn't carried by anyone's thoughts--and when it does go into somebody's head, it's done visually.
Two of mine. The first story I put on FITG, Beautiful Schemer, a Femme Fatale Noir that I am still very fond of.
And my first print piece...yippee!...which I have coming out in Short and Twisted, an Australian anthology that is dated to launch on June 20th. It's called Tethering the Bait. Story of a rape counselor and a very bizarre hotline call. I was very happy to have it included since the publisher was strictly limiting her acceptance of authors outside of Australia. I could see it have the same tension of Sorry, Wrong Number or something, but as a short film.
Some of the short stories I would love to see turned into films are Eddie Muller's WANDA WILCOX IS TRAPPED from the PLOTS WITH GUNS anthology (probably my favourite short story ever), Bill Crider's CRANKED and Megan Abbott's POLICY (both from the DAMN NEAR DEAD anthology) and just about any short story by Joe Lansdale. They are all fast, full of life (and death!) and when I read them I can really see them in my head. Visually they would make great short films.