Perhaps paneled wainscot or shiplap in the downstairs powder room? Beautiful powder room with wallpaper. Wallpaper is Crivelli Trellis BP 3102 by Farrow & Ball. Sconces are the "Alexa Hampton - Abbot Single-arm Sconce".
Chic powder room features walls clad in gray grasscloth wallpaper framing white studded mirror flanked by Thomas O'Brien Bryant Sconces over bow-front pedestal sink situated next to nickel etagere filled with bath accessories.