Chairs create a comforting feel in a room that can feel cold. The rich wood, carved back, and ornate shape of this chair bring warmth to this bathroom and anchors the space.
Near a bath tub, a stool is helpful for holding towels, or a magazine or drink while you are soaking in bubbles. This simple rich angle-legged stool adds character to this bathroom.
Here is another example of a chair anchoring the space. Choose one that makes a nice contrast to an otherwise monochromatic room. The warm red against the green/blue tiles creates interest.
If you have a countertop with open space underneath, add a stool. It can be pulled out to serve as seating or side table.
This stool turns a floating tabletop into a vanity.
Create a very shiny, glamorous bathroom with glass tiles, a clear acrylic stool with a plush upholstered seat, and a crystal chandelier.
How about a stool in the shower? This one is the Prince Aha Stool from allmodern.com.
A long bench along a wall opposite your sink can be useful for placing slippers or a used towel.