I would go with gray drapes , the same color headboard, some kind of linen ones by RH.

What fabric is on the headboard? A blush color would look great with the gray and white. These are velvet which would add a nice texture to the room but not take away from anything. https://www.westelm.com/products/luster-velvet-curtain-dusty-blush-t1802/?pkey=cvelvet-curtains&isx=0.0.0

Thanks celerygirl, that was another option I had thought of as well but thought it may be too obvious! Finding a Color match would be the fun part since the windows are quite close to where the bed is.

judd - I had considered velvet but never thought of doing them in another colour. If I went this route, do you suggest I integrate the blush elsewhere or let the curtains speak for themselves? Now to convince my hubby to consider this option. ;-)