Two Baths in the Same Materials with Dramatically Different Results

We recently did two baths simultaneously, one was a guest bath, and one a child's bath. To keep things simple, we used to exact same tile, vanity style and color, and stone in each. But MAN did they come out like complete opposites! And it was all in the decor and some small details. More on that later. First, to their mutually shared materials.
In both, we used a classic white and gray color combination. Timeless in bags especially. On the floor, this was accomplished with a white Thassos marble border, and a Carerra hex tile mosaic field like this:

On the walls, we used another classic- running bond subway tile with a molded cap and base profile. Very elegant, an old fashioned "sanitary" look.

We used white painted vanities and Carrera marble counters and thresholds, Kohler fixtures in polished chrome. But that's where the similarity ends. The trick was in the finishing, and it this case it came down to wallpaper – yes wallpaper. It really gave each their own strong identity. Take a look below and see if you can tell which is the guest bath and which is a young girl's dream bathroom.





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I guess the night light gives it away ?