My 5.5 year old son requested black walls, superheroes, and toys in his room. His favorite superhero is Ghost Rider and it took awhile to find art that featured him, but wasn’t too scary. I used his favorite colors throughout the room: black, blue, gray, and red. To maximize toy storage & play space I installed a closet system that accommodates all of his clothes & costumes as well as puzzles & boardgames.
The room came together with pieces from all over the place- some we’ve had for years. Bed/ headboard (Wayfair), chair & fan (Home Depot), art & blue pillow (Etsy), rug & red pillow (Home Goods), black bookcase & blue floor bin (Crate & Barrel), blue striped sheets (Walmart/ Gap), white duvet, white sconces, globe light, gray felt bins, nightstand, closet system (IKEA), curtains (West Elm), black sconce & air purifier (Target), smart piggy bank, door hook & black furniture legs (Amazon).
Although there are a lot of things in his room, there is still room to add more clothes and toys into the existing storage especially since we regularly purge (donate/ sell/ toss) items that no longer suit his needs.