I kinda posted this question last week, but I realize my question was too convoluted and mixing too many questions into one. Trying again.

Question: What shower wall tile should I used in the 2 kids' bathrooms upstairs?

Just about finished with office bath (no tub). Used 3 x 12 subway tiles for shower walls set in a 1/3 offset pattern. Floor tile is a medium brown/nuetral, not fancy.

For the other 2 bathrooms (demoing right now), they are 5 x 8s with tub/shower combo with shower curtains. I know what the floor tile is going to be in each, but I'm having trouble deciding about the shower walls for each. I keep coming back to the same plain white subway tile, but I'm wondering if I should choose something else so that all 3 bathrooms upstairs don't have the same walls? Or maybe that's okay, and I just need to vary the size or the layout from one bathroom to the next?

Girls' bathroom: Floor will be a marble-look porcelain tile in a 2 x 2 hexagon. Shower walls could be 3 x 6 subways, or should I consider something else? The vanity is SW tidewater and the countertop is Ceasarstone Frosty Carrina. There will be brushed nickle shower fixture/tub filler. Only the floor tile and shower walls are changing; everything else remains.

Goal: Keep it a bit delicate, feminine, soft. It has a bit of a beachy theme going on.

Boy's bathroom: Floor will be a medium gray porcelain hexagon (about 8" I think). Shower walls could be 3 x 12 subways set in a 1/3 offset, or maybe a stacked pattern to be a bit more modern, or should I consider something else? Since the floors are gray I could consider a marble-look porcelain for the shower walls bc that would coordinate with the floor, but I'm not sure if I should just stick with the subways. The vanity is SW Naval and the countertop is Ceasarstone Frosty Carrina. There will be shiny chrome shower fixture/tub filler, and I'm changing the faucet to shiny chrome. Only the floor tile and shower walls are changing; everything else remains.

Goal: Make it a bit more dressed-up, refined, a little more modern, but not too much. I need to add some art which will probably be an antique map we are getting framed. (Note: wicker cabinet is already gone; replaced with a nicer one.)

Thanks in advance!!! This is the last of the bathroom updating in my whole house. So excited to be almost finished!