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.
If you're not necessarily crazy about thinking about tiling all that walls, you could tile the walls around eye level, or whatever level you decide on. This will not alone leave you another part of the wall for you to paint, so you may add another color into the bathroom, but which creates the option of experiencing a border.
For something a little bit less drastic, you will discover a tile which has a pattern, but that is certainly also a similar color for the tiles you've currently picked. You can set these patterned tiles in the random fashion, very, so the rooms don't look hence plain.
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