Thinking about hiring a swimming pool builder? Looking for design ideas? Well, if you want a pool that looks natural, there are several concepts to consider. Take a look. 1. Skip the Perfect Shapes Traditionally, back yard swimming pools are rectangular or sometimes circles or ovals. Skip those shapes, and capture a natural vibe by putting in a pool that is a bit wavy. Variable curves help to make the pool look more natural, like a river winding its way through rocks and hillsides.