With the onslaught of digital cameras you can now and shoot a couple hundred of pictures in a day without spending a dime. Digital photography is a great way to entertain yourself and improve your photography skills quickly.
Be the paparazzi on a member of your family or a friend
Beautiful males or females (whatever you are into)
Candid shots (Just keep shooting till you get a good one)
Discover your own backyard
Friends making funny faces
Get out your camera and take pictures of anything that makes you smile.
Great body parts
Have your photo taken with as many strangers as you can possibly befriend in one night
Pets in funny hats, glasses or whatever
Pictures of the people you don't have pictures of
Sunrises and sunsets
Take a couch (Or any other inanimate object) and have strangers or your friends at all kinds of stores and landscapes
Tourist in your own town get as many pictures of you by the tourist attractions in your town