Hey Auzzy, Great question. The salesperson at the tile store near me suggested a mosaic of tiny marble squares for my master bath shower floor. I asked if it would be a pain to keep clean, and she said, "No, not at all." She said that the marble and grout would be sealed upon installation. Now, after reading the John Bridge site (thanks for the reference - I didn't know about that) I am worried. I didn't buy anything yet, but am close to needing to put the order in so the materials will be ready in time for the contractor. In my last bathroom, I had a tub, but on the bathroom floor there was slate that was gorgeous. I did have to seal it every 6 months but it was very easy to do. If that would be good enough so we can get our stone shower floors, I'd be fine with it. Experts?

Thx all. It came out better than I expected. The color is better in real life or earlier. This was at 7pm as the sun was setting. It turned out my fireplace is also limestone which I forgot because it was buried behind a massive sofa set. I think it will go well with the grey and espresso cabinets.

My DD used Daltile's Florentine Carrara for her tub surround and on her floor. She used the matte finish for both. She does not have a separate shower. That tile does come in a 2x4 mosaic. If you used that in the matte finish on the shower floor, it shouldn't be slippery. I do also think it would be fine to use the same tile on both the shower floor and bathroom floor. My DD used white grout and it actually looks a little to yellow next to the tiles. She wishes she had done a grey. Take a look at Custom Building Products Platinum or Rolling Fog colors. It looks to me like either of those might work.

Since you've spent so much money already, I second Sophie Wheeler's suggestion of Daltile Rittenhouse Square subway tile, 3x6. It is reasonably priced subway tile and looks good. A classic. And it won't cost you your other arm and a leg. Mark_Rachel's suggestion above of fireclay tile will be much more expensive. And those patterns/shapes he has pictured will again introduce too much movement.