I would clad it in horizontal wide timber flooring planks. Myself I'd go a grey, weathered timber like an oak, the engineered flooring can be bout in packs, so a single pack would create a feature inexpenssively. It will provide the oppotunity to introduce timber details in furnishings or kitchen accessories. Natural timber softens modern interiors, relaxes and adds character to traditional looks like provincial or hamptons styles. The wide plank will enhance the flow as a walk through, but still provide an intersting visual texture to the adjoining lounge area.

If you have not already made this kitchen I would like to help, it lacks adequate storage for good pantry space. If you need a lot of fridge space I am not sure that is the best method as it takes up a lot of space. The idea of adding the bench for the kids is a good concept but the high back means the kids can't see you all the time and they will end up on your side of the bench so they can see you. Incorporating space for the kids at the end of the island bench would be more functional for both you in the kitchen and the kids would be able to see you move around and feel a part of things. Also how will they use this space kids don't just sit still they will want a bench or something they can use to draw do homework etc. Colour contract of light and dark always looks good. If you need help call I have a kitchen company called www.louisdivine.com.au. My kitchens are more traditional styles but I can do whatever is required and given the detail used in my kitchens my prices are competitive. P.S white bench tops are not hard to keep clean and they don't date, the nature of the stone itself is easy to clean.

There is Quantum Quartz 'Cloudy Bay' which is a lovely stone similar to Caesarstone 'Oyster' and doesn't show too much up as it has markings in it already. Also you could consider Caesarstone 'Clamshell' which has a small amount of white & darker greys through it. Hope that helps.

Love the effort you're going to. But I'd have the entire island inc step down in the one colour, and the cupboard bench and splash back in the second colour. Remember once you add accessories and more importantly yourself the area will have plenty of movement and variety.