I used spoons and forks. You can use the spoons as is, but I altered them slightly for a more beautiful look and a better sound effect.
I flattened the curved bowl of the spoon.
After some trial and error I found that the easies way to do that was by pressing them in a work bench. To avoid scratches I covered my work bench with some rubber from a bicycle inner tube. Just gently press and move the spoon a bit from time to time.
They come out nice and flat after this step.
I used a large fork at the top, two spoons and two forks for the middle part, and some extra smaller spoons for the bottom part.