10 year olds.
For our metal tooling I used the lids of aluminium cooking containers. It was quite thick. I also had some red stuff that was a little like felt, for the children to have under their foil as they worked.
The children drew images on paper first. They copied the image onto the foil using sticks. They rubbed indian ink into the surface of the foil to enhance the image. They attempted to stitch their foil onto the red felt stuff. They displayed their own work onto card of their choice.