Bungalow-era baths were of the “sanitary white” persuasion. Not so the bathrooms built after the mid-1920s! Bright color and Jazz Age glamour continued through the 1930s. By the mid-40s, white tile was back.
Several approaches are tried-and-true when it comes to designing a bathroom appropriate for the pre-1860 house. You sure don’t want to replicate “an original,” and authenticity isn’t high on the list here. The goal is simply to make the bathroom, whether new or remodeled, fit in.