You can see I also decided to carry the smaller tiles up and over the top of the curb. This was really a decision based on the dimensions of the curb. Using the 2x4 tiles would require a lot of really thin cuts that would have been really obvious, but using the 2x2 tiles let me use nearly whole tiles across the whole surface.
On the knee wall I stuck with the tumbled travertine 2x4s. I have been saving the absolute BEST tiles for the top of the knee wall. The ones with the smoothest finish that were most matched. Because this surface will get hit with a LOT of water I wanted tiles without any nooks and crannies for stuff to get stuck.
You can also see how I decided to not break the running pattern between the tub area and the shower. I just continued three rows of tiles above the bathtub at the exact same height and will end up having to cut the tile closest to the tub. I will also use a row of accent pencil tile around the entire tub, and decided to locate the stripe based on where it could run as a continuous line including along the knee wall.