There are a variety of interior finishes available that can give your customized pool a distinct look. If you want to take a more traditional route, a white cement finish is the way to go. This will give your pool a clear, sky blue, classic look. If you are going for a more dramatic look, try a darker finish. The most common material used for finishes is pebble. Pebble interiors are gentle on your feet and can really grab the attention of your guests.