Navy is pretty neutral so it goes with a lot of colors. Some colors that would be fun accent colors are bright yellow or bright orange. Another modern option would be a pale teal. I would also add another fun pattern. One option that would be super cool would be to cover most of a wall in cork tiles and then paint them in a buffalo plaid pattern like the sheets but in a bright color. It would be a unique feature wall and a fun place for her to tack on the wall all of the posters and pictures preteens and teens like to put on their wall.

If she likes the bed colors, pick a shade lighter for the walls. Do an accent wall if she really wants a dark wall. (Doing the entire thing would be too dark overall).

Okay thanks! Well.. what about a light gray-blue wall? Like this photo:

Having a design which will satisfy a 10-year old, and last until she is 18 may be impossible.

If you're really serious about that, I'd recommend some appealing neutrals for walls. ceiling and floor, and add individualizing elements with furnishings and accessories which can be changed out as she gets older and her tastes predictably change.

Y’all are right. I didn’t expect my older son to be 5’ 7 1/2” tall at the age of 13 so we are now looking at replacement beds for the huge bunk bed he has. I wish we had thought about it though before we moved into our new home this past October. It’s going to be difficult to get the huge bed out of the house.

This is why I’m not of fan of built-in furniture in a kid’s bedroom or playroom. I’m a fan of neutral furnishings with personality displayed through removable wall art, bedding, and accessories.

Okay thanks. The thing is the bed is super expensive and so is the desk, and we didn't plan ahead. So... yeah. But okay, neutral wall colors. I feel like white wouldn't look good. Honestly, she doesn't want an accent color but something that's not white.

But yes I told her no built in furniture EVER. We can put ins stuff that can be removed but never permanent.

Pictures please

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How about SW Sea Salt? It's lovely. I have it in all our bedrooms currently, which includes >18 yo girls.

I also love RH Silver Sage.

And buy basics and change bedding and accessories..they will change their style several times so don't lock yourself in [I learned the hard way] and for sure no built ins [another hard lesson lol].