Rectangular Bathroom Designs . Proper vanity is all you need if you are tight on space for your washroom. Full master bathroom contemporary design. 17+ Rectangular Bathroom Designs, Ideas Design Trends Premium PSD from www.designtrends.com Common characteristics in modern bathroom designs include minimal use of color, sticking to neutrals, black and white, and then adding an accent element. Slick white subway tile lines the shower and bathtub behind a gray and white chevron shower curtain. Continue to 50 of 62 below.