This is a simple large space ACNH bathroom design with ground and walls fully paved with tiles, if you like this decoration style, you can found a variety of wallpapers and floor items in the ACNH furniture category on akrpg.com.  Here we can see Slate Flooring and Monochromatic-tile Wall are used, it also places Toilet, Bathroom Sink, Bathroom Towel Rack, Shower Booth, Shower Sandals, Shower Set, Bathrobe, Mom's Tissue Box, Toilet-cleaning Set, Digital Scale, and more Animal Crossing items.