A cat, a dog, a toad, a frog, a boy, a girl, a shell, a pearl, a sun, a moon, a swan, a loon, a cloud, a star, a swift racing car, a lion, a tiger, a lake, some fire, an ocean, a mountain, a big flowing fountain, a twig, a feather, a nice couch of leather, a vegetable and fruit, a piano, a flute, a bird, a plane, a truck, a train, a flower, or grass, but, dude, make it last.
Look in front of you and draw whatever is there, no matter what it is, just to see how good and real you can make it look. Also, draw things or people that you really have an interest in. Try different things for the variety, so that you don't do the same things all the time - variety is the "Spice of Life"! Try different lighting, and different compositions, as well as different techniques! Enjoy! Have Fun!