Seriously, you crazy people are shipping Anders and Cullen? Well it would be a complicated relationship, I'll give you that! 
What's wrong with Cassandra and Cullen. They're both warriors, presumably somewhat religious, have suffered at the hands of magic and yet are capable of retaining a level head about the whole thing, Cassandra likes stabbing books and we've seen Cullen stab things, they both have great hair - they are practically perfect for each other. If I wasn't so certain about keeping Cullen for myself that's the pair I'd go for. 
I'm fine with Cass x Cullen. It doesn't get me all excited with feels inside, but I like it.
I had an Anders x Cullen dream that just stuck with me. Never thought about the pairing before then, but since that dream, I can't forget it. I think Dragon Age is the first fandom where I've started shipping people with multiple partners. I guess it's the fact that my own character can romance someone differently each time; it's encouraged me to veer away from having OTPs (which is what I normally do in any given fandom).
EDIT: My only total OTP is M!Hawke x Fenris; I will read M!Hawke x Anders, or maybe M!Hawke x Isabela, but Fenris can only go with Hawke, specifically, my Hawke 
Just curious, what are everyone's Cullen-related OTPs? Other than Anders x Cullen and Cullen x Alain, I've got my M!Lavellan x Cullen pair. I'm okay with and would happily read about Cullen x Cass or Cullen x F!Cadash. Of course when it comes to you guys' fanfic I will read him however you prefer to write him; I've enjoyed all the various ships I've read thus far 