These appear to be west elm circle cut out chairs. I don't think they in the online catalogue anymore, but I did a quick search and it looks like some sets are coming up for sale on other sites.

May I suggest contacting the interior designer to request information on the tiles?

Sorry, I don't know how to load a photo, but the finished tiles look just like the Ladbroke Trc pavers above only it was done with poured, coloured concrete and then cut and grouted to make it look like pavers, hence no weeds ever! We had it done a terracotta colour which looks great. The sides were done as a wooden retaining wall with stairs up to the higher level of lawn, also done in the concrete. The advantage of concrete opposed to decking is that you never have to think about again as it doesn't rot like decking does after a few years and have to be replaced. It make cost a little more initially, but long term it's really worth the money. We finished off the top of the retaining wall with buxus hedging, but you could put flowers or whatever you fancied there. The concrete trucks have long hoses which can pump the concrete a long distance to the back of your house so no worries there. Hope that helps. Good luck.

Would be quite hard to find something like that here in Australia , have you tried at shotts ? Why don't you import them from America ? Cassie would deliver for you right to your door