From Vulture‘s interview with Richard Madden, who plays Robb Stark in Game of Thrones:
Kit Harington said that on the Iceland set, when they’re at the bar, they fight about theories. Same in Belfast?
Completely. Sometimes I text with Kit or Gethin [Anthony, who plays Renly], and we laugh at about how geeky we are. I’ve been having a lot of Robb Stark-Renly jokes recently, about Renly crushing on Robb Stark. That always gets a good laugh.
There is already fan fiction about the Robb Stark–Renly Baratheon pairing.
[Laughs hysterically.] I have not read any of it yet. But we’re sending texts verging on that.
Well, if I have to choose between the Knight of Flowers and Robb Stark, I’d go for Robb Stark too, heh.