Sure. Don't feel compelled to keep repeating a theme. Today's houses are much more eclectic in design.

One thing you might try-- you can get fancy without having to spend big dollars for custom tile. Might cost you a little more for installation, but not nearly as much as some of the pricier custom lines. You've got white tile going in the shower, with dark blue painted walls and a white vanity. Why not continue the nautical theme, and do a grey floor? Do it diagonal in the center, with a blue accent stripe, and then a straight border, somewhere between 3-6", depending on how big your bathroom is?

" light grout that is impossible to keep clean " A bath used by males is best with epoxy grout. The Pro tiler needs to have experience using this type of grout. I have it in my baths...it is impervious to any stain / dirt.

For a guest bath, the thing that will be missing is the frequency of repeat use that allows the skin cells and soap residue to build and not be addressed. As long as you have good ventilation, and the grooves are thoroughly cleaned with a soft brush following a visitor’s brief stay, you should be fine. It’s only should this turn into an everyday shower that you’ll run into issues. If that possibility exists, then the cleaning aspect may become an issue. Any surface, even glass, that doesn’t have the soap and skin cell residue removed, and has moisture remaining on it after the shower, can grow mold from that food. Ventilation helps a standard shower to dry out. The grooves in a design like this will be problematic from both a cleaning and a moisture aspect, and won’t easily dry at the bottom. The moisture is the medium for mold. The food for it is the detergent and skin cells. The solid surface shower itself is the inert petri dish. Mold won’t grow inside the material, or damage it. It can be cleaned off of the surface and be good as new. This is why I mentioned towel drying the grooves. It interrupts the cycle, until the food source can be removed.