Just to offer a different view point. Your floor tiles look amazing. Why not flow the idea through and use tiles of that ilk as your splashblack. We have just recently finished a kitchen with a similar feel and our client opted for patterned wall tiles as their splashback. Based on your comment about the floor being chosen to banish boredom If you are worried about carrying through more of the same tones and want to inject colour, you could always do this through your accessories, that way if you fancy a change.... The colour tones you have chosen provide a great canvas on which to complement or have fun with colour.

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I would replace the dark worktop for a white one, if you need a refreshing look as no light bounces on dark worktops, hence why yours looks so cramped. then you add a white splashback too, subway white tiles are the cheapest of tiles and glossy ones bounce off the light great, which creates a more airy kitchen.. If you go for mirror splashback, unless you have OCD and enjoy cleaning 3 times a day, then forget it. it will always look smudged.

At Lusso Stone we now offer splashbacks/ up-stands to clients with freestanding basins, we think this can help towards protecting paintwork ( if tiles are unavailable ). It seems to be working quite well as the stone resin material up-stand compliments the stone basins whilst making sure paint work stays well away from waster marks.