A "formal" pool provides a neat & classy look. This look is usually accomplished with some combination of the following:
- Clean, straight lines and/or geometric shapes
- Brick coping or "paving tiles" around the perimeter
- Stamped pavement, or brick or tiled decking
Use all of these features, and you get a very formal look. Combine some of these features with some features of a natural / free-form pool, and you'll create a style that is unique to you.