You need high-gloss green square tiles with high-gloss white square tiles. And then you need white grout...and pay a very good tile installer to do the job....a perfectionist with a price tag to match.

The 'look' is installation related...you can do it with pretty much any two square tiles.

It’s not the installation look she is going for, but we cannot find a square high gloss floor tile like this at tile shops in CT. I’m just trying to source it somewhere in the states.

Those high gloss green tiles look like wall tile, not floor tile. Quemere designs has lots of different greens.