Hi Mehgan. I'd advise against painting the wall behind the bed the same color. You could try painting it a darker shade of the paint color that matches the duvet. That, or paint a wall that is not directly in contact with the bed/duvet such as the wall opposite the foot of the bed.

Can hardly see the stripes in picture :(
can we see more of the wall?

Where is the duvet from?

I have this same duvet...purchased from West Elm :)

what color/brand is the wall

I think the stripes are beautiful.