Hi there, I would definitely go for glass & not tiles. Glass is much easier to keep clean! As for colours, if you have French grey units you could look at a slightly iridescent silver which would compliment well. Be careful with some colours if you are going to be a bit bolder as they will reflect & alter the appearance of the French grey on the cabinets. Get some samples & look at them in different areas under the units - the corners will look darker/lighter depending on natural light & if you have recessed lighting under the units.

We're with Valduff. Shades of purple and plum can really add depth to a chic scheme like yours. Particularly with your gorgeous counter top. Grey is also a good call, as it will coordinate with your kitchen units but allow room to add coloured accessories. It can depend on the light quality in your room- we always recommend grabbing some tester opts in a range of shades. Paint your walls or A4 sheets, and see what the colours look like as the light changes throughout the day.

I think you should use white so the kitchen doesn't look choppy ,but if you still want color try this idea

The dark colour. To the best of my knowledge it was discontinued many years ago. You post is confusing to me. What exactly are you looking for ... the doors or something else?