Fandoms: Harry Potter + Discworld Fusion
Title: Harry Potter and the Color of Magic
Author: andromeda3116/cupid-painted-blind
Summary: In which Harry Potter goes to the other school for wizards. No, not Durmstrang.
Pairings/Warnings: Background Lily/James
Need to know: Both series.
Link: andromeda3116.livejournal.com/207990.html


Fandoms: Danny Phantom + Rise of the Guardians Crossover
Title: Mistaken Relations
Author: Anne Camp aka Obi-quiet
Summary: Or why Bunny should avoid Amity Park. After all, white-haired boys with ice powers that can fly aren't exactly easy to come by, so this new kid had to be at least related to Jack...right?
Pairings/Warnings: None.
Need to know: Both series.
Link: http://www.fanfiction.net/s/8761010/1/Mistaken-Relations


Fandoms: Sherlock (BBC) + Harry Potter Fusion
Title: The Almost Empty House
Author: Rachel Indeed
Summary: An alternate universe story, set in the Harry Potter universe. Sherlock and John are on their way to Hogwarts. Sherlock is determined to live in an empty House, but things don't work out according to plan.
Pairings/Warnings: Invasion of personal boundaries.
Need to know: World-building basics of HP. Main characters of Sherlock.
Link:http://www.fanfiction.net/s/6847811/1/The-Almost-Empty-House


Fandoms: Harry Potter + Dresden Files Crossover
Title: The Master of Death
Author: rgm0005 (aka Ryuugi)
Summary: In one world, a old man's life ends. In another, a foolish wizard performs a ritual and calls upon the Master of Death. And in both, there is a sound-a sound like an oncoming train. To the well-organized mind, death is but the next great adventure.
Pairings/Warnings: Incomplete. Harry Dresden/Elaine. Canonical child abuse. Canon-typical violence.
Need to know: Both series.
Link: http://www.fanfiction.net/s/7779108/1/The-Master-of-Death
http://forums.spacebattles.com/threads/harry-potter-dresden-files-the-master-of-death-part-iiii.217211/


Fandoms: Naruto + Folktale Fusion
Title: Red Eyed Monster
Author: Loudest_Voice
Summary: That year's Chuunin Exams were a nightmare. Literally. One of the kids favored genjutsu.
Pairings/Warnings: Gore. Violence. Mind games. State-sanctioned killing.
Need to know: World-building basics of Naruto. Hatake Kakashi.
Link: http://archiveofourown.org/works/448143/chapters/767466


Fandoms: Fate/stay night + Sekirei Crossover (minor fusion)
Title: In Flight
Author: gabriel blessing
Summary: Honestly, Shirou was beginning to think that he should be used to this; being unwittingly selected to take part in brutal tournament that he had no idea existed until he found himself in the middle of it. Then again, second times the charm, right?
Pairings/Warnings: Incomplete. Violence. Sexual situations. Harem. Shirou/many. Past Rin/Saber/Shirou.
Need to know: Neither series.
Link: http://www.fanfiction.net/s/6556187/


Fandoms: Rise of the Guardians + Journey into Mystery (Marvel Comics) Crossover
Title: In Which an Unlikely Friendship Comes to Be
Author: Asidian
Summary: Loki recalls stories of frost giants, hideous monsters that bring the ice, as he takes in this creature of simple pleasure. He recalls that the people of Asgardia say he is just such a horror of winter – but here and now, watching this boy play upon the walls as though nothing else exists in the world, he does not see how it can possibly be a bad thing.
Pairings/Warnings: Child neglect.
Need to know: Both series.
Link: http://archiveofourown.org/series/30985


Fandoms: Torchwood + Vorkosigan Saga Crossover
Title: Can't Trace Time
Author: AJHall
Quotation:
Summary: Owen Harper swore once he'd never set foot in a hospital in a staff capacity again. But an accident with an alien artefact puts him exactly where he doesn't want to be: behind the administrator's desk in a large medical facility. To make matters worse, it's somewhere called Barrayar, which seems to combine far future technology with the social attitudes of an ancient episode of Dr Kildare. And then he's called to a Situation on the roof, and meets someone who reminds him eerily of home.
Pairings/Warnings: Bel Thorne/Owen Harper (explicit). Fraud and otherwise ethically dubious behaviour from the protagonist.
Need to know: Owen Harper.
Link: http://archiveofourown.org/works/619277/chapters/1117399

There are some shorter Sherlock/HP and HP/Discworld recs on crack_broom. In the interests of full disclosure, I know that they're there because I recc'ed them.

Ah. The HP/Discworld may not be what you're expecting. (I used the author's summary, which is more pithy than literal.) It's a oneshot set substantially before Harry going to Wizard school.

Fandoms: Thor/The Avengers & Being Human
Title: Housemates
Author: Coneycat
Length: +600k (first 8 parts of the series are complete. Part 9 is currently a WIP as an AU to this AU)

Summary: After falling from the Bifrost, Loki landed in the back garden of a small house in Bristol, England, and was taken in by the occupants-- supernatural creatures who know a thing or two about what it feels like to think you are a monster.

Now that he's no longer all alone, or entirely an outcast, Loki just wants a peaceful life. However, when you're the God of Mischief (even if you're technically an alien, and not a god at all) adventures just seem to find you...

Link: http://archiveofourown.org/series/14925

... I'm deeply in love with this series. Hurt/comfort at its finest. And just when you are about to sob into your handkerchief the author slams you with humour. Best combination there is, really.

Sorry I'm late with these. This is what I get for being away from my computer for a few days!

Fandoms: Buffy the Vampire Slayer + CSI
Series Title: Slayers/CSI
Author: Marcus L Rowland
Summary: It all starts when a corpse isn't as dead as it seems. The Vegas CSI crew get their eyes opened to the supernatural, and the supernatural world gets its eyes opened to forensic science.
Pairings/Warnings: Well, Lady Heather probably deserves a warning all her own...
Need to know: Both series, particularly Buffy season 6 onwards
Link: http://www.tthfanfic.org/Series-42

(Marcus has several more excellent crossovers hosted on Twisting The Hellmouth, particularly the "Supergirl Returns" series and the utterly batty "They Saved Milton Keynes.")



Fandoms: Buffy the Vampire Slayer + Noggin the Nog. Yes, really.
Title: Noggin and the Vampire
Author: SpeakerToCustomers
Summary: "In the lands of the North, where the black rocks stand guard against the cold sea, in the dark night that is very long, the Men of the Northlands sit by their great log fires and they tell a tale.

"They tell of Noggin, Prince of the Nogs, and how he journeyed far to the North, to the Lands of the Midnight Sun, to marry Nooka, Princess of the Nooks. They tell of Noggin’s wicked uncle, Nogbad the Bad, and how he schemed to make himself king while Noggin was away, and how he was exiled from the Land of the Nogs forever because of his wickedness. They tell of Graculus, the great green bird.

"And they tell of Spike."
Pairings/Warnings: None.
Need to know: the finale of Angel. Most of the Noggin background is filled in the course of the story.
Length: Medium (~9,700 words)
Link: http://www.tthfanfic.org/Story-6397/Speakertocustomers+Noggin+and+the+Vampire.htm



Fandoms: Buffy the Vampire Slayer + Supernatural
Title: Velveteen
Author: Eponine
Summary: "In which Xander hates being the bearer of bad news, Bobby hates uninvited guests, Dean hates witches, and Sam should have known better than to use that word." Brilliant idea, wonderfully executed.
Pairings/Warnings: None.
Need to know: about Wish Demons and the Winchesters' upbringing.
Length: Medium (~9,300 words)
Link: http://www.tthfanfic.org/Story-21329/eponine+Velveteen.htm


I could keep on pulling stories and authors off Twisting The Hellmouth for hours, but you'd get bored.