Our bathroom has the same tiles on floor and shower, but the floor is squares and the shower is rectangles. It seems to make sense. It’s like that in the guest bath, too.

Do you like the look? We’re planning on a hexagon mosaic for the shower floor that will complement this tile

I almost always advise same tile for bathroom floor and shower walls . I use 12 x24 porcelain in a color that works for your taste and decor then matching grout too. I find it allows the most ability to change wall color, accessoriesetc without major cost for a change. I do not understand removing the divider between the shower and the tub they should be seperate .

This is currently what we have between the tub and shower. It’s a half pony wall. The idea was to prevent spray from getting on shower glass to make cleanup easier, but I’ve heard some feedback that this is a very dated look. We are actually doing 24 x 48 porcelain and yes the goal is to match grout.

Correcting my comment to say, it’s all squares. The grout on the walls is white, on the floor is grey. and yes, I like the look. There’s enough going visually in the bathroom, the consistency is calming.

Question - what is the climate like where you live? Typically, you shouldn't put a niche on an exterior wall (you lose insulation in that area).

I am in a hot desert climate and they are using goboard for the niche

Couple comments (explaining thinking process rather than just stating what I personally like):

• Insulation is not just for comfort in cold climates, it is condensation mitigation too;
• When you use a shower waterproofing membrane on an exterior wall, that wall should not also have a second vapor retarder on the wall. You have kraft faced insulation and GoBoard being a double vapor retarder. Double check your requirements for a wall vapor retarder in your AZ climate to being with;
• For the pony wall (you'll need glass in any case), you have a drop-in tub. The pony wall is a choice. You can find examples of the shower glass sitting on top of the tub deck for a clean look (no extended pony wall) as another choice. However, consider you do not have any deck at the faucet side of the tub. You also appear to have a lip around the edge of tub, not sure on the tub spec and how the framing is done. No choice on the pony wall is necessarily wrong, but just note you have a lot of design lines going on here - the shower curb height, the tub height, possible tub lip, pony wall height, niche size/location, window location/sill height - nothing is aligned.
• Niches usually look better aligned with grout lines. Not sure that can happen here.
• Typically when the floor tile meets the wall tile, where you have large expanses of wall/floor that are seen together, using the same tile is a choice often made. Here, the bathroom layout does not really provide that occurrence - the wall tile is kind of in it's own separate little side of the bathroom. So it can be the same or different tile, I'm not sure either choice has a distinct advantage visually. Same with the shower hexagon tile, it's in it's own little section, visually demarcated by the tub/shower and all those design lines, so a different floor tile is not unexpected.

We use same tile but unpolished on floor, polished on shower walls. Matching small mosaictile for shower floor.

24x48 tile requires a very good tile setter who has done this before and has references . The tile size often is just too big for many bathrooms whereas 12 x24 can work in almost every size. 24 x48 is expensive and off cuts are a waste.I agree pony wall only as high as tub .

Consider this note for both the shower floor as well as the bath floor:

"For shower floors, always choose tile with a wet Dynamic Coefficient of Friction (DCOF) of 0.42 or higher, which is the North American industry standard for level, interior wet spaces. However, for bare-foot shower environments, safety experts recommend an even higher DCOF of 0.60 or greater to maximize slip resistance."

I believe this note if from Dal Tile.

How will the transitions between the many horizontal and vertical surfaces be handled? The specified Portobello Onyx doesn't appear to offer any matching trim pieces unlike the Emser Technique* 12 x 24 whose trim pieces include a 3 x 12 bullnose.

Patricia Colwell Consulting: "The tile size often is just too big for many bathrooms"

Yes.

-----

*an example, not a suggestion