Players per 2, facing each other. They can move (arms, legs, eyebrows) slowly, and the other player will mirror them. This is a game of give and take - no-one should be (continuously) leading. Keep movements slow.
Do this with the whole group: everyone in a big circle, and everybody mirrors everybody else. Also known as Group Mirror.
During implementation, you can use slowly music to create nice atmosphere and to stimulate participants creativity.