This is a simple moving object that I made form vibration buzzers and fish oil lid.

Those hobby toys are very common. You can use:

- electric bells,

- magnets,

- buzzers,

- or motors.

You can see that mobile phone vibration devices are connected in series. I used clear sticky tape and blue tack:

You can see my toy working in this video at 18 V input:

You can use less vibration modules and less voltage. You can also use button cells to allow to toy move on its own.