This would be a great project for a club, or maybe even just Cloverbuds.
Seems pretty straight forward.
Take some disposable pie tins, poke a few small holes in the bottom for drainage.
Fill with potting soil.
Make hand print in dirt a few centimeters deep.
Carefully sprinkle grass seeds in hand print.
Sprinkle vermiculite over grass seeds to cover.
This will allow the hand shape to still be seen until the grass starts to grow.
This could be kept on the window sill or even outside when the weather turns nice.
Make sure to keep it watered.
Send pictures of the process!