This is an amazing idea and I am afraid I cannot find the source of the photograph to give credit. I have even searched on google images. Each child makes draws around their hand and decorates. They are all put together to create this wonderful display.
Another lovely ideas is from the Crayola site.
It is a friendship heart
Draw a huge heart and cut it into pieces. One piece for every child in the class. They decorate and sign it and then the heart is put back together to create a display. A lovely activity to create ‘belonging’.