Bathroom Knee Wall Ideas . If you have a vanity built into your wall, you can incorporate that into the side of your shower. Incorporate the vanity into the shower. Bathroom Knee Wall Ideas Are the counter tops and knee wall threshold from dhiyanurhumayra.blogspot.com A strip of absolute black granite tops off the white knee wall that separates the tub and toilet. See more ideas about bathrooms remodel, small bathroom, bathroom design. With bathroom knee wall shower on outdoor open shower design ideas.