The combination of Thassos and Blue Celeste polished marble in a square and diamond mosaic pattern would create a striking visual impact. Thassos marble's pure white color contrasts beautifully with the soft blue hue of Blue Celeste marble, making for a sophisticated and elegant design. This mosaic could serve as a stunning focal point in various settings, from bathrooms to kitchens to accent walls. The interplay of shapes and colors in this mosaic would add a touch of luxury and refinement to any space.