I think that you need mostly white, but something in a print that incorporates your colors. Perhaps pillow slips or at least a mostly pea green painting/poster/wall-hanging that also has some brown, perhaps in the frame. You could also do a stencil on the pink wall using the green paint, some white, and some brown. How about a nice tree branch? You can also buy vinyl decals from Etsy or other places--not sure that you could get pea green, but brown and white should be available.

Under Browse Rooms, click on Bedroom. Then in the Search box, type Pink. It will give you a variety of rooms from subtle to over the top. [houzz=] [houzz=]

A picture is worth 1,000 words of advice at Houzz. Please comment here and use the Attach Images button to add pix of the space where you have the dilemma. Do you have an inspiration picture, piece of art, rug or fabric that is determining the color for each bedroom or are you just grabbing these colors out of a hat? White goes with all of them.

You can see difference between absolute white and morning glory....if you want to visualize this for your room try it on Asian Paints app to get a clear picture of your room.