Pebble mosaics are made of natural pebbles found in river beds are beaches of Indonesia, Bali, and other oceans. Pebble mosaics are collected, cleaned and mesh mounted on 12×12 sheets for ease of installation. Most common applications for pebble mosaics are shower floors, shower walls, patio decks, patio walls and swimming pool areas. Pebbles mosaics mostly have natural patina finish and there is no special finish required. We recommend sanded grout for pebble mosaics, due to large grout joint size between the pieces.