A "natural" or "free-form" pool provides a more relaxed and natural look. This look is usually accomplished with some combination of the following:

• Gentle curves; non-traditional shapes
• Natural rock, flagstone or "rolled beams" around the perimeter
• Natural rock or stone built-in at various places around the pool
• Rock or stone pavers, exposed aggregate, scrolled or stamped concrete

Use a combination of these features, and you can get the feel of a natural oasis. Combine some of these features with features of a classic / formal pool, and you can "class up" the look as much as you want.