Cove lighting creates a gap between the wall and the finely done tile mosaic wall making it more appealing to the human eyes. Here, the bathtub is highlighted by the natural light it receives coming from the window. The designer wants to project a cool ocean-like atmosphere in the room by using tiles in shades of blue. The idea is to create a soothing and relaxing feel of the water.
It doesn't mean that just because you have a theme that you will really fill the bathroom with items that jive to the theme. Use it subtly so that the bathroom will not look too busy and crowded. If you already have lots of accessories and items in that particular theme, you can just paint the walls with a solid color that still matches the theme.
To minimize space, you can use corner sinks, corner showers or corner baths. Choose the right size and style of sink. You may opt for a vanity unit, a pedestal a wall hung or an en-suite. Some bathrooms have a couch inside. You can actually use your creativity and choose the furniture to use that would suit your style. You can even use an antique dresser as your bathroom vanity. Choose the right size and shape for your bath tub and showers. Some even have saunas, whirlpool baths and spas. Make a unique look by customizing your bathroom. Also, consider concrete or limestone as surfacing material for a cool and clean look.