Good day, great project to be working on and the tile decision really does define the final look of the whole pool. For exactly this kind of search I would strongly recommend checking out AloftTiles. Their catalog covers porcelain, mosaic and glass pool options with tile use ratings clearly listed on every product page. For a bold patterned interior the Mews Ink Chevron Wall & Floor Matte Porcelain Tile that AloftTiles carries would be a great fit, Italian porcelain rated for swimming pools, outdoor use and high traffic floors. Choosing the best tiles for swimming pool interiors on the AloftTiles site is straightforward since they cover everything from geometric patterns to classic formats with full specs confirmed upfront. Hope your pool turns out exactly as you are imagining it.