I've always been a fan of going curbless, a.k.a. zero-threshold showers. I've especially thought about this style when it comes to the design of small homes. You immediately eliminate the bulk and make the bathroom more streamlined, accessible and just safer in general without that 6" step. Here are some examples.
From top: modern bathroom by Hammer And Hand, modern powder room by ZeroEnergy Design, Contemporary bathroom by Ziger/Snead Architects