@dysfun Gamecube purple. You may be on to something. I wouldn't mind having a good old retrowave wallpaper as a literal wallpaper. Problem with wallpaper is that the walls do not lend themselves well to wall papering. It's all rough-grain wood panelling, so I'd need to fix that first. And then there's the cost of wallpaper with your own image on it. It'd be around €800 just for the one wall.
If I had the mad graffiti skills, I'd just paint it on (although I hear paint brush cans are pretty expensive too), but alas, that is something I do not posess.
The previous owner of this house painted the bedroom moss/dark green. I'm not convinced I'd like that in the retro room (or, in fact, in the bedroom).
I might end up trying my hand at the simplest of simplest of retrowave patterns. A big orange / yellow ball but with bars of increasing size showing the purple background. Or something like that.
Or maybe I'll just go for gamecube purple all around :)