Make a list of all the characters in your icons. (Although you may have more than one icon of a single character, they only go on the list once.) Alphabetize it. Take the first two people on the list; that's your first pairing. Second two people; second pairing. Etc. Then write your reaction to each pairing (or a snippet of a hypothetical fic featuring each pairing).
Hokay, after again removing things like the Plague horse, Cheese-kun, Hakuryu, the emoturtle and the llamas, we get...
C.C. x Daniel (Code Geass: Lelouch of the Rebellion/Stargate:SG1) - Um... I.. Wow, start this meme off right, huh? And a het pairing, no less. I think the rest of the SGC would just assume Daniel was hit by the Weird Beam O' Light of the Week and keep C.C. under observation. It has potential, though, as weird crack crossovers go.
Envy x Gojyo (FMA/Saiyuki) - Oh, poor, poor Gojyo. XD There would be must hate sex in this pairing, methinks.
Goku x Hakkai (Saiyuki) - No. Sorry. Just no. I've yet to see a well done Goku/Hakkai fic, and that has biased me. Besides, Hakkai sees Goku as a child, and likely always will. He's fucked up, but I don't think he's THAT fucked up.
Harper x Hazel (Andromeda/Saiyuki) - heeeeeeeeeeeee! They might actually get along, what with being all anti-their respective universes' superbeings. They'd probably meet in a bar somewhere and share stories of murder and pillaging and why the Niets/youkai need to be exterminated. It could be the start of a beautiful friendship.
Kanda x Kenren (D.Gray-man/Saiyuki) - I'm not sure which one I feel sorrier for here. I mean, Kanda has to deal with Kenren, but Kenren has to put up with KANDA. Now I wanna see a DGM/Saiyuki crossover, though. *bats her eyelashes at the few people who know both series*
Kyouya x Mama Sha (Ouran High School Host Club/Saiyuki) - ...OUCH. Just ouch. I have nothing else to say here.
Omi x Ren (Weiss Kreuz/Diabolo) - This pairing would still be adorable, and still end very badly. Assuming Omi could get past Rai, of course.
Sanzo x Shuichi (Saiyuki/Gravitation) - I still say this is effectively Sanzo/Goku and/or Yuki/Shuichi just with one of the names changed. Come on, you can't say you all don't see it.
Tenpou x Zelman (Saiyuki/Black Blood Brothers) - Excuse me while I dot for a while. ........... *deep breath* Hokay. Better now. This... might actually work. Somehow. I'm not entirely sure HOW, but it might. They've got amazingly similar personalities, though, so the conversation would be interesting, anyway. Lots of condescension all around.
...Wow. Saiyuki is a real fandom bicycle, ne?
ETA: Zweig is SO Daniel Jackson with a quarterstaff. This amuses me more than it should. /random Suikoden ramblings