You need to focus on Geometric Depth. Instead of literal "gaming" symbols, go for 3D textures or dark tech patterns. Check out the geometric and blueprint-style murals on wallpaper for boys. I used a dark charcoal 3D pattern for my son’s setup. When you add some subtle LED strips behind his desk, the wallpaper catches the light and looks like a high-end tech studio. It feels "pro" to him, but looks like a clean, designer room to me.