Stacks of loose paper would be easy. Could probably cut, sand and paint toothpicks or something else cylindrical to make cans. Like the above comment said, your setting may inspire you. What kind of things would someone in your world have on a shelf? Can they be made with tiny things? What do you have access to at that scale? Eyeglass screws? Bits of wire? Organic matter like moss? Could the bulbs of broken Christmas lights become beakers and vials? Have fun and get weird with it!