Skylights are a great way to let more natural light into the room, with the advantage that it's rather unseen, and when it is, you have a great view of the beautiful sky. Skylights are basically a window that is inset into your roof in some particular room. Skylights are not limited to any shape or size, but a long rectangular skylight seems to be the option most often used. If the house that you are currently living in does not already have a skylight, do not fear, you can bring in a professional to have a look and appraise the situation for you.
After taking some measurements and checking structural integrity, you'll be able to find out how much it is going to cost you to have a skylight put in. Of course some areas may not be able to support a skylight, but that is unavoidable. With your newly aquired skylight, you'll have tapped into a new source of natural lighting, really brining the room to life.