You’re pretty lucky if you have a large enough window in your bathroom that could use a seating area right beneath it. A bathroom reno featured on Beneath My Heart uses an upholstered loveseat bench with added accent pillows for the window area. How about a built-in? This vanity featured on Home Bunch has a bench area near the window, while this other example (also from Home Bunch) creates a window seat out of a bathroom storage unit. You could also try a bathroom storage unit on a much larger scale with a bench as well, like the third option below from BHG. Built-ins are great, but they’re not for everyone. You could try a simple wicker bench with an elegant cushion to place by your bathroom window, like the one below featured on House of Turquoise.
Apartment Therapy shows a really interesting bathroom design where a bench on an outer wall extends right through the glass into the walk-in shower. Another great and simple example of a shower with a bench (again from Carla Aston) makes use of wood material for both the bench and flooring. You may not have a ton of room for a full-sized bench, so a corner built-in might work instead. This one featured on Angie’s List looks great in this smaller shower! Another from BHG highlights the top of the bench with white.