Can you share pictures? I tore out a 20 year old slate bathroom (including shower,) last year and it was the best thing I’ve ever done. Hated the material and would never go back. Glad you are considering porcelain.

We need some pictures but I do not mixing real and fake together . Why not look for a hex tile in the blue from the porcelain tile you are using

https://s3.img-b.com/image/private/c_lpad,f_auto,h_80,t_base,w_80/v3/product/daltile/daltile-s77213brickms1p-5328.jpg

This is what I had to go behind tub on wall.

https://images.homedepot-static.com/productImages/661a72a6-049c-4499-ba32-125537c85ace/svn/tuscan-blue-daltile-porcelain-tile-cs5612121p6-64_1000.jpg

This is the porcelain that I decided on for my shower walls. Just trying to find some mosaic or smaller accent pieces for the shower floor.

Daltile has a wide color selection of 4 inch tiles (and trim pieces) that would be suitable for the floor. Try a local tile distributor for samples instead of Home Depot. Or contact Daltile directly to see what they recommend with their Tuscan Blue porcelain.