Sansa Stark and Sandor “The Hound” Clegane will wind up together.
This is not your typical romance, or even your atypical one. Sansa, who once pined for the pretty Joffrey and the prettier Loras, was afraid of the scarred Hound, even though he rescued her from a riot. Before Sandor fled King’s Landing during the Battle of Blackwater, he offered to take Sansa with him. She refused. He pulled a knife on her and made her sing, then he kissed her and left. Although she doesn't know why, she kept his bloodied cloak.
Later, the Hound seemingly dies (Arya leaves him, bleeding, without the gift of mercy), and Brienne later spots a gravedigger in the Quiet Isle with wounds that match the description of the wounds the Hound had received. So, they're both alive, and that could lead to...
OK, maybe it’s not a rumor. Perhaps, after reading all of this fanfiction, it’s just a wish.