I am not sure how deep and bright the two colors are that you each have selected but I might suggest that you pick a green and blue that are soft rather then intense colors. My favorite paints are ones that are made by Restoration Hardware. Of course you can get any paint company to help you achieve very similar colors. Look up Restoration Hardware and see if there are greens and blues that you each like. Most of their colors work with each other. Have fun..........

Ah, okay. It is a bed then. It can be converted into terrific seating with cushions, maybe a long bolster against the wall. I like Studio10001's suggestions. Going back to Chookchook's comment up top, I suggest that the first thing you do is find sheets or fabric your daughter would like for her bed and when the two of you have decided on that, post a picture of the fabric here and we can all pitch in with further colour (and other) suggestions. I'm intrigued by what's hanging on the lines strung across the room. ?

OP has made a duplicate post about this dilemma. Please send comments at their original post. Thank you https://www.houzz.com/discussions/design-dilemmaboys-room-age-3-and-6-dsvw-vd~1003444

Multiple posts.