The problem with the built in flash is that it is small, limited power and only faces forward. Once you get a proper speed light you will be able point the light in any direction and bounce it off walls and ceilings. Even better than that is that you will able to use Nikon CLS to fire the flash remotely off camera using your built-in flash as a master. The possibilities are endless. If you do use it off camera using some type of light modifier may also help. Brollies, reflectors, gobos, gells and diffusers can all help make the speedlight suit your needs. The shots in this thread:
http://www.ausphotography.net.au/for...rd-of-our-life! all use remote speedlights bounced off the walls, you can see the soft light it creates. I don't have any examples of direct flash because like you I don't shoot that way.