I like the black ceaserstone with everything else white. I think avoiding a stripey effect is the key to being two tone and having the right midtone in the room to tie it together, grey can work well, or a warm neutral that will echo the tones of the natural wood of the floor. You can try painting the wall above the tile a darker colour to tie in the dark of the bench. There may not be much wall left above the splashback and around the overheads but it will still pull the space together. I like the idea of everything white except the bench top. Grey overheads will make the room seem smaller, definately white on top! Wooden blinds would look good with the floor too. If you want to go all white try and put some variation of texture or paint the wall a darker shade, even beige or cream or grey, grey/blue. It will break up the white feel. white on white works well IF you have variation in texture and really good quality finishes. Otherwise it can look soulless, boring and like a rental.

Do you have any pics of the space you're updating? The only advice I have is to make sure you have lots of windex on hand! I have a coloured glass splashback and notice EVERYTHING! Dried water droplets, oil sprays etc. The light from my balcony shines right into the kitchen though, so you may not have this issue!

It all depends on your other choices. What colour/type of cabinets, benchtops, flooring, lights other furnishings in adjoining rooms etc. Can you give us more detail?

have same floor tiles with the divider