Go for turquoise, it will match your modern/electic style - love it!

White for sure , and yes you could add a stripe of a colored glass tile mosaic I would just make it one color. But IMO the best is just white and then add the color with accent pieces like in this pic

The tile is very pretty. I don't know if it is just the colours showing up differently on screen but the light grey appears to be a different tone (more purple to me) than your tile. If you want a light grey I would take the tile to the store and try for a better match. The dark color ties in nicely to the tile and could be very dramatic and stunning if the room gets a lot of light.

Hi no idea what colour flooring for new medium sized, L shaped kitchen. Planning for Howdens charcoal cabinets, quartz worktop (white with moderate marbling), white tiles with grey grout for splashback. Thanks.