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.

Pottery Barn have a similar style see http://www.potterybarn.com.au/hayes-tufted-upholstered-barstool http://www.classicfurnishings.com.au/our-product-range/detailed-product-template-144617155 https://www.houzz.com.au/products/linen-bar-stool-prvw-vr~17280111 Good luck!

Have you already sourced your tiles? I would expect most tile stores could help you find the edging tiles which I think are typically termed 'pencil' tiles for the style you have shown. We used bevelled subway tiles in our DIY ensuite. In hindsight we would have aimed to finish the brick pattern with 1/3 and 2/3 sized tiles (like in your pic 1) rather than full and 1/2 (pic2 and 3) to give a more even edge thickness/profile... Might not suit and we didn't use capping tile (I lost that arguement!) so it is probably more obvious in our bathroom, but just something you might like to consider.

Where are you located? I have seen these at cerdomus tiles in Richmond and Moorabbin tiles in Moorabbin if you are in Victoria.