Black Curtain Rings Remodelled Bath - What Color To Paint Walls?

Remodelled bath - what color to paint walls? - black curtain rings

I have a very small bathroom. The floors are tiled, shower beige w / mortar the same color. It is a frieze of glass mosaic tiles in the shower black. The oak vanity with granite, black and beige. Bathroom and toilet are white. Shower curtain is beige. Shower rings are square black acrylic gloss (from waste and the tissue can cover). Two small bath mat is black. No windows. What wall color would work best scheme?