Invention help please?

Question

i have to recycle, reuse, and re-engineer everyday materials into out-of-the-box inventions. What items of trash (discarded materials) what can i use to make the invention

the only idea i got so far is put a magnet in a ball and call it ball magto

NEED HELP!

Answer 1

take an everyday office chair, remove the wheels, and make roller blades / roller skates.

Answer 2

use the ball, the magnet, an old led tube flashlight, and some copper wire, to create a faraday's law flashlight. if you add a capacitor you can build up a charge and use it without having to shake it continuously. Otherwise you wont get power unless your ball magto isn't moving across the copper wire.

Answer 3

take old discrded 2 liter bottles, partly fill with dry ice, recap tightly, makes big noisemakers.