Ser Loras, a brown hair knight, defeated Robar Royace in the tourney. Loras was riding a snow white Stallion. After defeating Robar Royace, he gave red rose to Sansa complementing her beauty and told her 'Sweet Lady'. It parallels with Lyanna receiving rose in the tourney by Rhaegar. Also Jon, another brown haired guy, with a snow white beast, think about giving flowers to a red haired girl. Both Loras and Jon are in knightly institutions.
Isn't it beautiful? 😊
Know why I am certain that there will be a "true flower" and a subversion of all the false suitors?
Because Brienne already proved to us that there are true knights. No matter how unlikely, it is not all lies. Jon is the blue rose.
Same as Sansa will prove to Jon that not every dream has to be a lie. That the softness he is trying to suppress is his strength, and that he can be loved in the way he really wants without proving or hiding himself, even weak and even flawed.