First, create more space—or at least, the illusion of it.  The majority of homes have small, cramped bathrooms; half-baths can be little more than closet sized.  If taking down a wall isn’t an option, consider other ways to make the bathroom seem more spacious.  Don’t use the bathroom for any more storage than necessary.  If some cabinets and dense shelving units can be removed, do so.  Keep extra towels, and additional bathroom, cleaning, and hygiene supplies in a nearby hall closet. For storage space that is necessary, choose sleeker, more streamlined options—open shelves, instead of bulky wall cabinets—whenever possible.  Extra mirrors that lie almost flush to the wall will extend the space also.

Next, choose a theme for the room.  A theme can be as simple as choosing a color palette, or it may incorporate a motif.  Incorporate the theme with the functional objects of the bathroom—rather than cluttering the space with non-functional knick-knacks.  A theme can be expressed using the things every bathroom needs: towels, soap, shower curtains, occasional rugs, and so on.