I love greyish coloured/weathered looking timber. I have done a concept design called "beach house" where I used the same coloured timber decking....I love it! Images are on my Houzz profile and website if you want to look. All the best :)

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We used concrete look tiles in our bathrooms, and decided on the same tile (outdoor version) for our pool area. We also used it for our pool coping and waterline tile and edge of the steps. The tiler cut the tiles, and we had a guy come onsite to hone the edges (same effect as the ones in your photo, but same tile on coping and waterline) who did a wonderful job and really reasonable price. This may not be what you are after, but we did not want any glitzy tiles. Photos below

I agree with Mel N, all charcoal with some pots of lime green grasses in perhaps tall red pots. Charcoal will also cut down the glare from the water. Tall pots as below will look great or shallow pots with bamboo.