I have a spirit week at school and I need an idea for one of the days

The day is called character day.

I can't go out and buy anything and I don't really have anything already to make a cool character.

Does anyone know a cool idea that uses simple stuff around the house?

Do you mean a TV or movie character? You could do ANYTHING. Be a cartoon character, or a movie, book, TV character. You could be where's waldo, that would be cool and you could get really creative with it. I think first you need to decide on the main idea, like what character you're going to be, before you try to find stuff to make it. Think about what clothing you have, and if you have an old shirt, in art class or something use the supplies in the school to make it however you want, or go to a friend's house if they have stuff.

A Rock Star.. Spiked hair... dark eyeliner ,dark lipstick. Boots and jeans with a tattered sleeved tshirt.