Here are a few ideas. Consider a door with etched or frosted glass, but with a thin frame of clear glass against the wooden frame of the door. That frame of clear glass allows the light to come through but retains the sense of privacy from room to room. You could also cover a glass door with a film which has a design, such as small dots or stars which would allow the light to shine through. Brume can supply this type of film. You might also consider a stained glass door from The London Door Company.