Toys for bunnies?

I want to donate some stuff to my school's animal area and I want to know what's considered safe or not safe for them! What i currenly have in my house is cardboard, empty toilet rolls and newspapers but I also wanted to know if some brands of cardboard could be bad for them of some sort? I'm not sure if it's ok for them to eat cardboard or paper so I would like to have as much help as possible! :)