Wallpaper would make it too busy IMO. I would replace the vanity instead, with something black with clean lines.

I think I would just paint the walls a pale gray or white, and do all decorating in black and white, to play up the deco feel. Will need to paint the vanity too.

I agree with above posts that wallpaper would not help. White walls and painting everything else black would look very cool. I have pink tile with dark grey trim (original to the 1920s bathroom) and I painted all my trim and woodwork the same dark grey. Really looks cool that way.

Paint the walls white. Get a fabulous fabric with peach, black and white and make a Roman shade for the window to tie it all together.

I need a wallpaper or wall color for this peach & black tile bathroom. I am painting vanity black, possibly ? The walls are getting primed in this pic, any advice will help! Thanks

It's looking better already.

I'd replace the vanity with a pedestal sink. Scour restoration and salvage shops for a period sink. Remove cabinet above the toilet. Maybe you can find "Art Deco" shelving when looking for the sink. Definitely go with the white. By the way, I think your bathroom is awesome!

Just noticed the white towel bar. Replace that or paint it black.

White and black are too dominating themselves,I would bring it down to minimum like the paper holders need to be removed.Bring some Olive green in paint, or hang a plant from the arch.Dull shade of olive green will balance the high tome black and medium peach.Maybe paint the black tile with leaves and small peach flowers if U can afford time

http://lindsayandandrew.blogspot.com/2012/11/painting-tile-who-knew.html

http://remingtonavenue.blogspot.com/2015/08/the-girl-who-painted-her-tile.html

i would love to see what you ended up doing. That bathroom is identical to my bathroom and i cant stand it. by any chance are you in Detroit Mi I've been house hunting and every other house i see has the exact same bathroom.