You could hang a picture. Or simply enjoy the quiet space : ) .

A big tobacco basket?

some wood shelving with orchids, african violets, trailing plants,,,or maybe a stag horn fern. (hanging or mounted)

that is also the perfect wall for some cool accent tile. have you thought about that? you could shiplap that entire wall and paint it any color since your entire room is white. this one is black and would look cool w/your wall. then put the stag horn fern or two, or some trailing plants on a shelf across it.

you could tile the lower half, span w/a wood shelf, and paint above,,,hang art

tile the entire wall like they've done here w/the white.

or do a reclaimed wood, or some cool mosaic tile. honestly, there are a million things you could do.

A giant mural.

Large heated towel rack?

storage cabinet with hooks or towel bar below

I would put a couple of pictures