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.

Do you want to keep the "black falcon oven" as the feature or do you want the island to be the feature? If you want to keep the oven as the "feature" in the kitchen, then I would do the island in the same cupboards and benches as the rest of the kitchen. If you wanted the island to be a complimentary "feature" to the oven, then you could perhaps do the same cupboards, but go with a black benchtop (although I would personally avoid a black benchtop due to it easily showing dust, water spots, etc). What material will be "under-bench" be on the island bench? Is it also going to be a feature (e.g. a graphic print, timber or something else)? Will the island bench have waterfall ends? If the island bench already has some level of visual interest, then it may not need anything more (i.e. different materials). You can always add visual interest to the island bench with accessories.

I've noticed a recent trend of the vertical color on the island matching the vertical color on the splashback. Liking that trend. So I would say go with the turquoise glass splash back color. Deepen it a little so the hue is closer to that of the floor. Cant tell from pic whether island cupboards are the same color as cupboards above the splashback. If they are, all the better. That then brings the turquoise/white combo forward into the room and gives some unity.

Clear island bench. For prep,serving,eating, etc. ONLY Keep the messy dishes away for both cooking and cleaning