Interesting choice! Using Frost colored grout with Frost tiles creates a monochromatic look. This can make a space feel larger and more streamlined, but it can also be a bit plain. Here are some additional thoughts:

• Consider the size of the space: Monochromatic designs can work well in large open areas. In smaller spaces, they may make the room feel closed in.
• Texture: If you're going for a monochromatic look, consider adding textural variation with different tile finishes (matte, gloss, etc.)
• Accents: You can add pops of color with area rugs, throw pillows, or other decorative elements.

Overall, Frost grout with Frost tiles is a valid choice, but it depends on the desired aesthetic effect for your space.