I love that outfit. I thought about making that one too(I may later).
Since there is nothing canon you can basically do anything you want. I would agree they're cherry blossoms, so they are pink. Personally I would have gone with pink,gold,and light green. But that is one of the great things about cosplaying manga, it's all good.
Attending This Year
Hera (Star Wars Rebels)- Working On
Steampunk Sailor Moon- Maybe, I'll see
Lumpy Space Princess- Working On