I've been doing noir AUs for fan-flashworks:
Fandom: Captain America movies
Summary: A man who doesn’t remember who he is witnesses a series of mysterious murders from his apartment window. Private Investigator Steve Rogers decides to help him solve both mysteries. Steve/Bucky, 1940s noir AU. (Warnings found at top of the fic)
Fic:
http://fan-flashworks.livejournal.com/331812.html Fandom: Leverage
Summary: Noir AU (cracky version), where Eliot is a private investigator, and Parker/Hardison are a couple of thieves who get under his skin. Hardison/Parker, with pre-Hardison/Parker/Eliot and past Eliot/Aimee.
Fic:
http://fan-flashworks.livejournal.com/331195.html Fandom: White Collar
Summary: Drabblish. 1920s noir AU. Neal Caffrey is the best private investigator in the underworld. He never expects a woman like Elizabeth Burke to walk through his door. Peter/Elizabeth, with Neal/Elizabeth UST.
Fic:
http://fan-flashworks.livejournal.com/330442.html Other fics, fairly short:
Fandom: Leverage
Summary: For this prompt at comment-fic on lj: Leverage, Eliot/Quinn, Huck Finn was their favourite
Fic:
http://archiveofourown.org/works/1835467 Fandom: X-Men DoFP
Summary: For this prompt at comment-fic on livejournal: Charles/Erik, "When you fish for love, bait with your heart not your brain." -- Mark Twain
Fic:
http://archiveofourown.org/works/1835485 Fandom: Dark Angel
Summary: Detective Matt Sung spends the night at Logan's place, but eventually, they decide to put work aside and have some fun. Their first time together.
Fic:
http://archiveofourown.org/works/1827556