Here is a fun way to let your guests know your powder room is occupied.
Emtek's Brighthandle actually lights up on the exterior side of a door when the interior side is locked. I could also see this hardware in a restaurant or in a darker hall. The stainless steel lever is available in a variety of patterns including the Luna Fuse (as shown above) and the Luna Dot. You can also choose from a beveled rosette, disk rosette, or square rosette. Brighten up your hall and let your guests know the room is occupied!