Pool tile
4x12 glass subway tile
Penny tile example
This looks like a 2x2" tile
Merola Tile Galaxy Penny Round Sky Porcelain Mosaic Tile - available at Home Depot https://www.aquablumosaics.com/collections/porcelain-pool-tile/products/mishaima-6-x-6-1-box-44-pcs-porcelain-pool-tile
Fujiwa Opal 1x1" Pool Tile https://www.aquablumosaics.com/collections/porcelain-pool-tile/products/opal-1-x-1-porcelain-pool-tile-2
Fujiwa North Sea 1x1" Pool Tile https://www.aquablumosaics.com/collections/porcelain-pool-tile/products/north-sea-1-x-1-porcelain-pool-tile
Aqua Marine 1x1" Pool Tile https://www.aquablumosaics.com/collections/porcelain-pool-tile/products/aqua-marine-1-x-1-porcelain-pool-tile
US Pool Tile Cloud 2x2 Series - Olive Blue CLO231 https://www.poolsupplyunlimited.com/us-pool-tile-clo231-cloud-2x2-pool-tile/153194p1
National Pool Tile Resort 2x2 Series Glossy Tile - Marine Green https://www.poolsupplyunlimited.com/national-pool-tile-rst-marine-resort-2x2-series-glossy-tile/169553p1
National Pool Tile Resort 2x2 Series Glossy Tile - Aruba Blue https://www.poolsupplyunlimited.com/national-pool-tile-rst-aruba-resort-2x2-series-glossy-tile/169555p1
National Pool Tile 2x2 Glazed Series Pool Tile - Navy Blue HM240 https://www.poolsupplyunlimited.com/national-pool-tile-hm240-glazed-2x2-pool-tile/79744p1
National Pool Tile Mini Koyn 1 1/8" Square Pool Tile - Olive Blue MK 1331 https://www.poolsupplyunlimited.com/national-pool-tile-mk1331-mini-koyn-pool-tile/79771p1
National Pool Tile Mini Koyn 1 1/8" Square Series Pool Tile - Pacific Blue MK1341 https://www.poolsupplyunlimited.com/national-pool-tile-mk1341-mini-koyn-pool-tile/79773p1
National Pool Tile Mini Koyn 1 1/8" square Series Pool Tile - Caribbean Blue MK255 https://www.poolsupplyunlimited.com/national-pool-tile-mk255-mini-koyn-pool-tile/79776p1
Cepac Rudiment Sky
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