We have walnut cabinets, a dark grey floor and stainless steel counters - very similar to your setup, but we have white painted boxes. We went with a handmade recycled tile, the debris series from fireclay. It was a fight to the death between a pale blue and a pale sage green, and a lot of discussion was had about format - 2x8 versus 4x4, etc. They have a lot of colors and formats to choose from.

I was inclined toward white until it was all installed, and I realized that was too boring and the room needed color.

Youngdeb, thanks for sharing! Your backsplash is really nice! I love it! I'm really leaning towards glass tiles and just like you before, not sure what color or size! What is this color? What grout color did you use to make it pop?

This is crater lake, the grout is white. I thought about glass too...there are a lot of beautiful options at glasstileoasis.com.

You might get more responses if you post a pic of your space.