A soft, warm grey shade would look lovely, and can be as dark or light as you want. A warmer shade will work with the brown stained wood floor, and the grey will complement the black granite. You could have an undertone of green, blue or tan if you didn't want a pure grey. And it would look nice with any silver metal hardware, either polished or satin/brushed, so you could choose pewter, chrome or nickel. It would still work with white trim too.

Your choices don't flow well to me. The flooring in your photo is pretty (very dark...are you okay with it showing every footprint, smudge, and dust bunny? If so, that's fine). From all of your options there I would do white cabinets with the Himalaya White granite. But you said ignore the granite. :) I would go for the gray cabinets with white quartz everywhere in that case, but personally I'd worry about gray cabinets being very dated in a few years. Is there another quartz option that you could pair with the white cabinets that is light in color and maybe has some movement, like LG Bianco Drift?

Well it depends on your wall color as well . since you have such concrete looking floor I would recommend you can chose any electic color like lemon , orange , yellow to give a bright look and uplift room mood or chose any pastle color of your choice for subtle feel . :)

Sujithra, Good that you asked. When the cabinets are made in factories they are made a tad smaller than your actual requirement or as per the standard size made by the vendor. Smaller size helps them to make sure it fits in your space. Once a smaller product is fitted in a bigger space - the remaining gap is filled with a 'filler'. Its usually made in the same finish as the shutters so that they are less noticeable. No, it is not essential for the cabinet door to function properly but more for aesthetics. Width of the filler, as explained above, depends on the site details but usually vary from 50 - 150 mm. Thanks, Amit Cornerstone Designs, Bangalore.