Hang a curtain rod draped with sheer curtains (or fabric) at headboard height, behind the bed, then add some white holiday lights behind the fabric and across the rod.--- maybe just a string of lights over the headboard :)
Built in tree book shelf - Inspiration Only but this is gorgeous. I so want this in my next home. There is also another tree on my project board I want to put in the same room as this. This would be great for a kid& room.