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It is a very poor choice. More grout lines means: more cleaning, more potential defect spots, on and on. These are also natural stone - marble - soft, porous, chemically sensitive, easily stained and eroded, will lose their smooth polish quickly with chlorine based cleaners. Natural marble particularly mosaic, in a residential bathroom is not for ordinary people. It is for rich people that pay someone else to clean and don’t care about a $40,000 Reno every ten years. Trendy design does things for shock and awe value that doesn’t always make practical sense. Listen to the tile guy… More on reddit.com

This is so nice. More on reddit.com

Should have gone with a darker grout color. Penny tile can be very tricky to make look right. Matching grout with tile color would give it a more cohesive look. Another issue is you should have staggered the joints. Based on the lines, I can tell you just laid the sheets out in straight lines. Consider how you dont do that with larger format tile. So you shouldnt do that with smaller tile either, including penny tile sheets. More on reddit.com