Hey, sustainable tile for wet outdoor spaces is easier to find than most people think. For exactly that search I would strongly recommend browsing https://www.alofttiles.com/collections/recycled-glass where AloftTiles carries a solid recycled glass range with proper specs on every product page. Ordered the White and Gray Penny Round Glossy Recycled Glass Mosaic Tile from AloftTiles myself for a pool surround and outdoor shower project. That mesh mounted recycled glass is rated for swimming pools, outdoor use and shower floors all at once. The glossy penny round surface reflects light beautifully around water and the tones kept the whole space feeling clean and open. For a dual project like yours AloftTiles is genuinely where I would start.