I think you'll love the 'Spiral-verse' of Goddessofbirth's "Jiverick" fic series. Her LJ is all friends-locked because of stalker issues, but there are accessible links to her various series from her fanfiction.net listing (http://www.fanfiction.net/u/2176828/goddessofbirth) and on her shared fanfic LJ (http://prozacandcandy.livejournal.com/tag/crossover%20%28firefly%2Friddick%29), so you shouldn't have any problems finding these stories, even if you've not previously had occasion to friend her.