For tight curls - Tear a towel into strips. When your hair is damp wrap it around the towel like you would a curler then tie the ends of the strip together. A lot easier to sleep on than curlers. For a loose curl - Bring your damp hair into a pony tail on top of your head, hold it with your hand, don't put a band or you'll get an ugly line. Then twist it all the way to the bottom and then spin it around into a bun on top of your head. You can use a band over the outside to hold it in place. Leave it until it dries or overnight. When you take it down you have nice curly hair.
depends how long you hair is! it also depends how curly your hair is naturally too. mines down to my bellybutton and pretty wavy and what looks good is if you french braid your hair in TWO braids (while your hair's still wet). :) hope this helps!