Go to the tile supply store and see what is on sale.

So many options--2x6, 3x6, 4x8, etc. Search Houzz for photos of bathrooms with straight stacked tiles and you can get a better idea of what is possible and what you like.

These are 2.5x8:

Fun Mid Century Bathroom · More Info

These are larger, no mention of the size:

San Francisco Floating House · More Info

Horizontal, 6x24:

Contemporary Bathroom · More Info

I got these results in about 5 minutes. You can also ask how large the tiles are, and perhaps get an answer. Or maybe the question was already asked and answered. Scroll down to the questions and read them. You need to do some work yourself.

You can do anything from a 1x6 to a 24x48.

One size does not fit all!

If you want to limit the amount of grout, then you probably want to start with 12 x 24 tiles. A very popular size found in all types of colors/patterns.

Really looking for something like a 4 by 15 1/2. Love that look! Thanks to all of you😊

If the 4 by 15 1/2 is $24 per square foot, and the 3 by 6 is $5 per square foot; which one will you choose?