Are you old enough to remember the Preppy Handbook?
If you were born after 1980 then the answer is no. But that's okay - I think we all know that pink and green is a color combination typically associated with headband wearing girls named Muffy.
No matter how chic and sophisticated this palette can be in decor, we hear "pink and green" and think about turtlenecks with little whale motifs and twill skirts paired with penny loafers. Okay - maybe you have to have been born before 1980 for that specific imagery...but "pink + green = preppy" is a color bias firmly now rooted in American culture.
Here are some rooms that are decidedly pretty in pink & green...
Preppy or not, I think Muffy would approve!