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.
Natural stone tiles provide a beautiful timeless finish to your bathroom and are available in several different guises which provide differing characteristics and wearing grades. You must understand that natural stone will vary across a batch and will need a cleaning regimen that includes sealing occasionally to keep them in great condition. They can be used on walls and floors, but there are some quirks inherent with stone that will need to be aware of in regards to fixing them as they have higher requirements than the standard ceramic or porcelain tile types.
For tiles which might be not so sleek, you can possibly space the tiles firmly together or leave a smallish gap. A 1/8th-inch gap belongs to the standards used with tiling.
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