Specifically wallpaper, A throw for the end of the bed, accessories and maybe some artwork for the wall.
Bedding is white, Bedside lamps and curtains are pale grey, Drawers are (going to be) black-brown malm units from ikea.
I really like the wallpaper below, I think the dark units will look good against it, But I'm not sold on it.
www.designerwallpapers.co.uk/colours/yellow-wallpaper/kayyam.html#yellow-wallpaper