I'll come with two examples, but only one floor plan. I wanted to play around a bit ;)
This probably won't be liked if you think that white half-height tiles in front of a white wall look too colorful. Personally, I also don't like colorful things, but I like contrast, so that something either stands out or visually recedes.
And since I'm not satisfied myself (I don't like the tint of the floor either, it’s not what you have there) and I have time, I spread out my fuss :cool:
Maybe you can make use of one or the other contrast, at least it can inspire some discussion :)
Image 1 a slightly different floor plan, optimizing the shower (160 cm length), toilet with a view out the window, softer bathtub shape
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Image 2 shower tiles in the same tile or color as the floor, pre-wall and 120 cm tile backsplash behind the toilet, bathtub and washbasin in mosaic that connects both colors white/natural.
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Image 3 here it’s rather the other way around: a framing of the elements you look at, in natural like the floor
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Image 4 washbasin, asymmetrical with mirror cabinet in front of a white wall
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Image 5 mirror cabinets in front of a beige wall
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Message: if you have a nice washbasin, put it in the spotlight, let it disappear if it’s ugly.