Sure, it's not for everyone, but it doesn't require water and you never have to mow.
There are a wide range of reasons that you might want to cover up what's underfoot on your deck or balcony with artificial grass. Dreary concrete or aged decking can be covered or even accented, or maybe you just can't have a living ground cover where you are. The images above show how gorgeous it can look. This isn't the artificial turf of the 1960s. You can get anything from a low pile turf to lush, realistic grass. Purchase it from a roll, as rug, or even in tile format if you want to do something a bit different.
Artificial turf can add a touch of color and softness to your outdoor space. Consider it for smaller areas like balconies or smaller decks. On a larger surface, you can intersperse it with other materials, like wood, stones, or concrete.
If you can't have grass, or don't want the hassle, head down to your local building supply or hardware store, and have a look at their artificial options.
And as always, if you are going to start this, or any, project, plan, plan, plan! Take some measurements, browse some inspiration images, plan a color scheme and think about what you have and what you will need.