Excuse my duh-ness but i'm having difficulty trying to follow whats going on here. Are these two photos an exact replica of your house and pool ? If not a hasty sketch with dimensions could help a lot. By kitchen wall do you mean the wall behind the bar ? And where is the pool wall ? Are you considering the covered area as being "inside" ? Sorry for all those questions lol Sometimes when you have a design problem you need to turn it inside out or on it's head. If you can't beat it maybe embrace it by making a feature of it : i.e. contrast by having the lightest colored pool surround and a great blue or tile inside and under the overhang, something that will echo the water color ? If you have a great covered area as in photo you'll most likely be spending a lot of time there and it could be soothing to be able to sometimes retire into a darker inside. In my book, 10M isn't small and also contrasting two floor colors doesn't necessarily make a space seem smaller and confined and may in fact even open it up. Could it be that you've thought yourself into a box here ? Sometimes one needs to give it all a good shake up and see how it resettles.

Depending on functionality, how your island is used, it can be somewhere to showcase a different material, as in a traditional kitchen with a substantial timber top, or if it's a practical prep area, the durability and maintenance is of utmost importance. If it is a highly utilized work area the surface would be best suited to reconstituted stones, which are man made such as Caesarstone, essastone, quarel la etc, as natural stones such as granites and marbles are more porous and require some maintenance and care. Depending on form and style, your options are almost endless. Cntemporary spaces can indulge in stainless steel tops, acrylic solid surface tops that can be any thickness, profile and can actually be repaired without joints. Glass or concrete are more options. So you ask for help on choosing your island bench top, That is dependent on a great many things. Factor in how you would use is surface, and what you can afford, then think about the overall impact these options can provide on the entire space. Eliminate. And collect samples to make your decision. It will probably become the single most used space in the house.

The all black kitchen looks scary as. Maybe because there's no lightness in there at all.

So if I want to include sustainable things in my house, where should I start?