Cascade ™ Shower Panels are a decorative and highly practical range of interior panels for bathrooms, shower and wet room applications. Featuring unique properties, they provide a flush waterproof and moisture resistant wall. Available in a great choice of colours they are easily installed to existing or new walls and can be affixed to all types of surfaces. They are a cost effective and practical alternative to tiling, do not require grouting, require minimal maintenance, and feature easy-clean, wipe-free surfaces to keep their look and water repellent properties. These extra wide panels quickly fit together and come with a range of finishing trims to ensure a great look backed with a 10 year guarantee. Take a look at this fantastic range of wall panels. Maybe this is something that you would consider having in your new wet room? order free samples to check out the products.

These are similar but not identical - http://www.ebay.co.uk/itm/Natural-Stone-Parallel-Regency-Black-600-x-70-x-10mm-gauged-riven-price-per-m2-/232313303708?hash=item3616f3b29c:g:ArMAAOSwUKxYkz1E

Lovely tiles but bottom looks like a natural stone tile I sold a while back. Price - £520 per sqm!! There was a soaked travertine option which didn't sound great as travertine isn't that waterproof anyways! The £500m² was from https://allnaturaltiles.co.uk :) Although lovely, I would go for something along these lines, you'd still get the same contrast effects even in gloss - https://www.britishceramictile.com/british-ceramic-tile/denim-gloss-wall-bct52166  https://www.johnson-tiles.com/ will do any tile, any size any shape in loads of colours, drop them an email with these images and I'm sure they'll help :)

Mandarin Stone?