Tone on Tone
Tone on Tone doesn’t have to be boring.  Keeping things all one color or in the color range and making the textures and patterns different gives a very elegant feel and makes it easy to change at any time just by changing your theme color.
I am attaching four pictures that show examples of tone on tone in the darker neutral fields yet it can be in any color range.  Hope this gives you inspiration.
Neutral Living RoomLiving Room in Dark Neutral Neutral Stone Bath