A dark grout might seem different, but so long as you don't look for a grout that is usually so dark this looks black, you ought to be fine.
One popular solution for a bathroom is to create a wet room, which is basically a walk in shower room that is much more comfortable than the enclosed shower types. These can be created to suit virtually any room type as long as a few simple rules are followed. The room will need to be waterproofed (tanked) to provide a seal and water leaking downstairs or next door. The tiles will need to have falls created if they don't already exist in the substrate, to allow the water to drain and the water to not pool in an area.
oilet wall tiles tend to be small, the same coloration or monochromatic and possess light-colored grout- the actual decorative cement between the edges, which is usually difficult to thoroughly clean.
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