Can be formal or informal, they can make your travel fast or slow it down. If you have a smooth concrete path you can move quickly through the garden, with an irregular flagstone walk or gravel path can slow you down. Patios need to be useful in how you use them, what kind of furniture do you have, how easily can you move it around, all of those things are factors in selecting the appropriate materials in your patio or walk. Patios can extend the living space we try to coordinate so the indoor and outdoor look like they were designed together.