This activity uses kraft paper taped to the wall, but to simplify, just use a regular paper and you can choose to colour instead of paint.
Kraft paper, paint and paintbrushes
Paper, pencil crayons, crayons or markers
Draw overlapping shapes all over the paper with a black marker, pen or pencil.
Colour in or paint all of the smaller shapes that are creating from the overlapping.
You could set the challenge that no two touching shapes can have the same colour.