A few years ago, Charlotte Moss imagined this chinoiserie bathroom for Elle Decor. Some of her inspiration came from that earlier arbiter of English country-house chic, Nancy Lancaster, who was known for furnishing baths like "real rooms." Hence the Regency-style bamboo caned chair with ottoman, French-style end table, and twin sinks dropped into a French cabinet.
Although this bath is roomy, several of Moss' elements could work well in a tiny space: the graphic wallpaper, ("Treillage Sidewall" from Brunschwig & Fils) the tailored window shade, ("Mikado Blue" cotton from Christopher Norman) and the black tole lantern.
Below are two great geometric wall-coverings from Walnut Wallpaper, "Bamboo on Mylar" and a Florence Broadhurst pattern, shown last.
(Sorry I can't identify the illustrator above.)